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 with a non-speaking cameo in "Intern for the Worse".
She returns with yet another non-speaking cameo in "Making the Grade".
She later appears as a background character in "Frog Wild".