Trachtenberg made her first television appearance at the age of three, in a commercial for Wisk Detergent. She went on to feature in over 100 more commercials. She appeared in her first credited role as Nona F. Mecklenberg in The Adventures of Pete & Pete from 1994 until 1996. During the same period she played Lily Montgomery in All My Children, in which she first worked with future Buffy star Sarah Michelle Gellar.
