Weil continues to be active in the Los Angeles theatrical community during hiatuses, is a regular performer at the Ojai Playwrights Conference in early August and radio dramas with L. A. Theatre Works, and still occasionally performs in live theater in Philadelphia and New York City. She has acted with every member of her family; in 2004, she headlined with her father in a well-received community theater production of Proof at the Montgomery Theater in Souderton, Pennsylvania, just north of her adopted hometown of Lansdale. Her first ever television role in 1994, which was an episode of The Adventures of Pete & Pete called "Yellow Fever", found her playing a bully alongside her mother Lisa, who played a teacher (she would also play a second role later in the series as a love interest to Big Pete in the episode "35 Hours"). Her younger sister Samantha shared the screen with Liza in Gilmore Girls' third season finale, "Those Are Strings, Pinocchio". Samantha Weil played a student named Bernadette (who was unrelated to Paris) making out a video yearbook entry in front of an impatient Paris, standing off to the side waiting to make her own.