Regrets

Kimmy regrets bullying Ava. Not because bullying is wrong or because Ava never did anything to her.

No she regrets it because she didn't know Ava's family was strongly connected to the mob. Before long they abducted my and bound/gift wrapped her for Ava to do with her what she wanted.

Ava remembered she always wanted a pet but couldn't because of allergies. She decided Kimmy (later renamed to Cunt) would make the perfect stand in.