Holly Herkimer is the former friend of Debbie Gallagher.
Holly went to Debbie’s birthday party just because Lip was going to be there. Holly tried to have sex with Lip, but he refused to have sex with her, due to her age. In response, Holly ran away to her house.
Holly helps Debbie transition out of childhood and into the more grown-up world of boys and girls - prostitution.
During There's the Rub, Holly hangs out with Debbie. She and her other friend spots Debbie’s brother Carl who stops by to peeks in. At first, she is hostile before becoming flattered with him flirting.