[6][failed verification] In 1989, Sibbett won the role of Laurie Parr on the CBS comedy The Famous Teddy Z, co-starring with Jon Cryer and Alex Rocco.
In 1991, Sibbett was cast as status-conscious bombshell Heddy Newman on the Fox sitcom Herman's Head,[7] which quickly gained a cult following on the young broadcast network and lasted three seasons.
Beginning in 1994, she played the occasional role of Carol Willick on Friends, a part-time stint that lasted until the end of the show's seventh season in 2001.
[14][15] In 2019, Sibbett won the Michael D Publishers Award, a nonfiction writing scholarship to the Story Summit Writer's School, to complete the manuscript of her memoirs, About Jane.
[17] Sibbett has long been an advocate for survivors of domestic violence, working with the nine shelters of 1736 Family Crisis Center in Los Angeles.