Dionne Ackerley entered into a written plea agreement with the government pursuant *521 to which she pled guilty to one count of conspiracy to distribute 100 grams or more of heroin, in violation of 21 U.S.C. §§ 841 (a)(1), (b)(1)(B), and 846. Subject to certain exceptions, the agreement stipulated that, in exchange for Ackerley's cooperation, any new information Ackerley might provide about her own criminal conduct would not be used against her in the determination of her applicable Sentencing Guidelines range or the decision to depart above her applicable range. The agreement also contained a waiver of appellate rights. Prior to sentencing, the government filed a motion to depart downward from the applicable range, which stated, in relevant part, that information Ackerley provided aided in establishing a base offense level for her sentence. At sentencing, the government reiterated that Ackerley's cooperation helped establish a base offense level for her sentence. Sent. Tr. 8, ECF No. 295. The district court 1 ultimately sentenced Ackerley to 234 months imprisonment. Ackerley contends for the first time on appeal that the government breached the plea agreement because it provided her self-incriminating proffered statements to the probation office in order to support the drug quantity calculations contained in the presentence investigation report and to establish a base offense level for her sentence. In response, the government argues Ackerley has failed to meet her burden under plain-error review and thus the appeal waiver should be enforced and her appeal dismissed. Having jurisdiction under 28 U.S.C. § 1291 and 18 U.S.C. § 3742 (a), 2 we enforce the appeal waiver and dismiss the appeal.

I.

Generally, "a defendant is allowed to waive appellate rights." United States v. Lovelace , 565 F.3d 1080 , 1084 (8th Cir. 2009) (quoting United States v. Andis , 333 F.3d 886 , 889 (8th Cir. 2003) (en banc) ); see also 1A Charles Alan Wright & Andrew D. Leipold, Federal Practice and Procedure § 180 (4th ed. 2008) ("A plea agreement may include a waiver by defendant of h[er] statutory right to appeal ...."). Ackerley argues, however, that the government breached the agreement and, therefore, the appeal waiver is unenforceable and her appeal may proceed. 3 "Issues concerning the interpretation and enforcement of a plea agreement are reviewed de novo." Lovelace , 565 F.3d at 1086-87 (quoting United States v. Paton , 535 F.3d 829 , 835 (8th Cir. 2008) ).

Because Ackerley did not object to either the calculated base offense level or the drug quantities attributed to her in the presentence investigation report, we review for plain error. See id. Thus, Ackerley must show (1) error, (2) that is plain, and (3) that affects her substantial rights. See id. at 1087. "[I]f the above three prongs are satisfied, [we have] the discretion to *522 remedy the error-discretion which ought to be exercised only if the error seriously affect[s] the fairness, integrity or public reputation of judicial proceedings." Puckett v. United States , 556 U.S. 129 , 135, 129 S.Ct. 1423 , 173 L.Ed.2d 266 (2009) (third alteration in original) (internal quotation marks omitted); see also United States v. Olano , 507 U.S. 725 , 732, 113 S.Ct. 1770 , 123 L.Ed.2d 508 (1993) (noting that an appellate court cannot overturn a judgment "unless" plain-error review applies or "unless some other provision authorizes the error's correction"). "Meeting all four prongs is difficult, 'as it should be.' " Puckett , 556 U.S. at 135 , 129 S.Ct. 1423 (quoting United States v. Dominguez Benitez , 542 U.S. 74 , 83 n.9, 124 S.Ct. 2333 , 159 L.Ed.2d 157 (2004) ).

II.

Despite it being her burden, Ackerley has not identified which, if any, of her proffered statements were allegedly used to calculate the drug quantities contained in the presentence investigation report and to establish her base offense level. Nor can she rule out that the information used in the presentence investigation report may have come from independent sources, which was permissible under the plea agreement. Ackerley explains that she does not have enough information to determine if the government breached the plea agreement and that the existing record before this Court is insufficient to make such a determination.

Her explanation amounts to a fatal concession that she cannot show error, much less "plain" error, from the existing record. 4 Ackerley requests we remand the case to the district court for a hearing into whether the government breached the plea agreement. This request, however, overlooks the fact that this Court cannot grant relief unless Ackerley satisfies all four prongs of plain-error review, see Olano , 507 U.S. at 732 , 113 S.Ct. 1770 , two of which she has conceded she cannot establish based on the existing record. Moreover, she does not provide "some other provision" that would authorize relief. Id. ; see also United States v. Yijun Zhou , 838 F.3d 1007 , 1015 (9th Cir. 2016) (Graber, J., concurring) ("The Supreme Court has left very little room-if any at all-for the judicial creation of exceptions to [plain-error review].").

Even assuming without deciding that Ackerley has established the first two prongs of plain-error review, "remand is not automatic." United States v. Olson , 667 F.3d 958 , 964 (8th Cir. 2012) (Benton, J., dissenting). In this case, Ackerley "must make a specific showing of prejudice to satisfy the 'affecting substantial rights' prong ...." Olano , 507 U.S. at 735 , 113 S.Ct. 1770 . 5 "Since the rights in the plea agreement relate to sentencing, [Ackerley]

*523 must show that h[er] sentence was affected by the breach." Lovelace , 565 F.3d at 1088 (citing Puckett , 556 U.S. at 142 n.4, 129 S.Ct. 1423 ). Specifically, she "must show a 'reasonable probability, based on the appellate record as a whole, that but for the error [s]he would have received a more favorable sentence.' " Id. (quoting United States v. Pirani , 406 F.3d 543 , 552 (8th Cir. 2005) (en banc) (internal quotation marks omitted) ).

Ackerley fails to establish prejudice under the third prong. She states that the government's breach of the plea agreement "not only affected her substantial rights it also seriously affected the fairness, integrity, or public reputation the of [sic] judicial proceedings." Appellant's Br. 17. Such a conclusory statement, however, is insufficient under plain-error review. Accord United States v. Jackson , 220 F. App'x 317 , 330 (5th Cir. 2007) ; United States v. Ray , 147 F. App'x 32 , 36 (10th Cir. 2005). Indeed, to accept her statement as satisfactory would turn plain-error review on its head; "proving plain error prejudice 'should not be too easy' and 'demand[s] strenuous exertion to get relief.' " Pirani , 406 F.3d at 552 (alteration in original) (quoting Dominguez Benitez , 542 U.S. at 82 , 124 S.Ct. 2333 ). Furthermore, as explained above, Ackerley is unable to point to the precise statements used in violation of the plea agreement or to explain how the use of such statements affected her sentence. See Puckett , 556 U.S. at 142 n.4, 129 S.Ct. 1423 . Ackerley does not respond to the government's argument that the information used in the presentence investigation report to establish her base offense level was available from independent sources; therefore, there was no need to use her proffered statements to calculate the drug quantities in the presentence investigation report. 6 The Supreme Court contemplated that "[t]he defendant whose plea agreement has been broken by the Government will not always be able to show prejudice ...." Id. at 141 , 129 S.Ct. 1423 . This case is illustrative. 7

III.

Because Ackerley has not met her burden under plain-error review, we enforce the appeal waiver and dismiss the appeal.