YA/Teen/Fantasy - Girl lives with roommates, parents are MIA, local store is evil and if you go in creatures try to put things in your pockets so you can be punished, punishment head on a stake spoiler ahead

[Anne]

One of her friends/schoolmates is turned into some kind of animal as punishment for stealing.

There is also a spirit or something that drives motorcycle?

The store has a living area attached and the female protagonist goes in and in the end figures out what happened to her parents... I think.

[Lobstergirl, au gratin]

When did you read it?
Cover?
Author female or male?

[Lobstergirl, au gratin]

Anne, are you still looking for this or did you find it?