She has dark brown hair, 3 pairs of eyelashes, and buckteeth. She wears a pink shirt, purple blazer, red skirt in a checkered pattern, purple stockings and brown shoes.
Mollie first appears in "Lincoln Loud: Girl Guru" where Flat Tire asks her out. She accepts his offer at first, but then rejects after learning that they would go to a funeral. This causes her to change seats and call Flat Tire a weirdo.
She then appears in "The Waiting Game", where she makes yet another small cameo when Chandler was passing out the invitation using a plunger.