Along with the rest of Vanessa's group of friends, Lacie is allergic to bees as shown in the episode "Skiddley Whiffers".
She attended Vanessa's party in "Night of the Living Pharmacists" and is seen in Vanessa's class in "Doof 101"
Lacie is a teenage girl with purple hair, probably dyed, which she wears in pigtails. She wears a black shirt, grey earrings, and a black brace on her neck. She has big blue eyes and dark red lipstick. Her head shape is also similar to Stacy, her non-goth counterpart.
It has been said at the San Diego Comic Con in 2009 that she is the equivalent of Stacy for Vanessa.
Lacie is the only non-spectacled female in Phineas and Ferb that doesn't have eye lashes.
The women with glasses and no eye lashes are; Carla, Lulu Jones, Melanie, Dr. Doof's date in "Get that Bigfoot out of My Face", and Charlene Doofenshmirtz.
Charlene had lashes when she appeared without glasses in "Excaliferb".