This Wendy Kesselman -produced play was Trini's professional acting debut at the age of nine.

Elizabeth Swados's "singlehandedly" laboured youth story based on actual city children writings, with also many of the twenty performer cast being actual runaway kids. A musical about kids alienated from the surrounding society. Trini had her first Broadway leading role in this Joseph Papp production. First shown at Papp's Public/Cabaret Theatre (March 9, 1978 on, 76 performances), Broadway première at the Plymouth Theatre on May 13, where it ran for 24 weeks, until 31 December. Tony nominated on five categories.

An Off-Broadway production based on the Dutch Jew Anne Frank's world-famous diary which she kept while hiding during nazi occupation. This short-lived revival of the 1955 play was performed at Playhouse 91 on New York's Upper East Side with its première on October 13, 1985 (57 performances). Trini had the leading role as Anne Frank, and other roles were played by Betty Aberin, David Cady, Merwin Goldsmith, George Guidall, Hal Robinson, Ann Talman and Dana Zeller-Alexis.

This biblical stage piece by Stephen Schwartz is a light-hearted dramatization of Matthew's Gospel from Jesus' baptism to his crucifixion. An Off-Broadway revival at the Lamb's Theater which featured, along with Trini, Anne Marie Bobby, Mia Korf, Laura Dean, Harold Perrineau and Eddie Korbich.