In May 1999, Peil appeared in the Yale Repertory Theatre's production of the Noël Coward play Hay Fever. She played the beggar woman in Sweeney Todd at the Kennedy Center in 2002 and in the spring of 2003 she played the mother of Antonio Banderas's character in a Broadway revival of the musical Nine. In the winter of 2003, she again appeared off-Broadway, starring in Frame 312, Keith Reddin's play about the Kennedy assassination. In 2008 she appeared as the Old Lady and Blair Daniels in the Roundabout Theatre Broadway revival of Stephen Sondheim's musical Sunday in the Park with George.