musical Saved with music and lyrics by Michael Friedman and a book by John Dempsey and Rinne Groff in 2008. She appeared in Bachelorette at the Second Stage Theatre and in Adam Bock's A Small Fire, opposite Michele Pawk and Reed Birney. Keenan-Bolger starred as Mary Flynn in the Encores! production of Merrily We Roll Along, which played at the New York City Center from February 8 through 19, 2012. In 2011, she starred in the New York Theatre Workshop production of Peter and the Starcatcher, a stage adaptation of the 2004 best-selling children's novel of a similar name. She reprised the role of Molly in the Broadway transfer production of Peter and the Starcatcher, which played at the Brooks Atkinson Theatre from March 28, 2012, through January 20, 2013. Keenan-Bolger received Drama Desk Award and Tony Award nominations for her performance. Keenan-Bolger played Laura Wingfield in the American Repertory Theater production of The Glass Menagerie alongside Cherry Jones, Zachary Quinto and Brian J. Smith, from February 2, 2013, through March 17, 2013. Keenan-Bolger reprised her role in the production's Broadway transfer, which ran from September 5, 2013, through February 23, 2014, at the Booth Theatre. She received a third Tony Award nomination for her performance. Keenan-Bolger starred in the Lincoln Center production of Sarah Ruhl's The Oldest Boy, which began performances at the Mitzi E. Newhouse Theater on October 9, 2014. She participated in a reading of The Brave Little Toaster: The Musical as the titular character. Others involved included Carol Channing, reprising her role as the Ceiling Fan. In early 2015, she appeared in a live reading of Eric Carle's Animals, Animals for the Autistic Children's Trust in Bangor, Maine. In 2016, Keenan-Bolger played Varya in the Roundabout Theatre Company production of The Cherry Orchard. She starred on Broadway in To Kill a Mockingbird as Scout, which opened in December 2018 and closed in March 2020 due to the COVID-19 pandemic. She received a Tony Award for Featured Actress in a Play, a Drama Desk Award, an Outer Critics Circle Award, and a Drama League Award nomination for her performance. Keenan-Bolger reprised her role when the Broadway production reopened in October 2021 and played her final performance on January 2, 2022. In November 2020, Keenan-Bolger was announced as part of the cast of HBO's new series The Gilded Age. She played Mrs. Bruce in the first season of