Girl with Pink Flower Shirt was a background character in South Park: Bigger, Longer & Uncut.
According to a now defunct website, Girl with Pink Flower Shirt originally had a large role in South Park: Bigger, Longer & Uncut, where she was originally a M.A.C. spy, however, by the end of the movie, she had sided with La Resistance. She was later shot with a stray bullet, and after a tearful exchange with Eric Cartman, Kyle Broflovski, and Stan Marsh, she hacked into the "Cosmic Control Center" in order to switch her and Kenny McCormick's "heaven/hell passwords", resulting in her going to Hell, while he went to Heaven. However, the site provided no evidence and was closely interlinked with fanon, so any information beyond her status as a background character should not be treated as canon. In the final version of the film, she makes a few background appearances.
She has cherry blonde hair, a pink sweater with a flower on it, and lime green pants.