Phoebe's coworker
Ray and Erin
Lisa Avery (credited as Lisa Calderon) appeared as Phoebe's co-worker in "The One That Could Have Been, Part 2" (season 6) and as Erin at Joey's Bamboozled audition in "The One With The Baby Shower" (season 8).
Lisa Avery is best known for Tenacious D in the Pick of Destiny and Scream 3.
According to the Friends listing at IMDB, she was a stand-in for 193 episodes from "The One With Russ" up to "The Last One, Part 2". She was uncredited. A stand-in for film and television is a person who substitutes for the actor before filming, for technical purposes such as lighting and camera setup. Stand-ins are helpful in the initial processes of film and television production. See Stand-in at Wikipedia.