First of all, we don't know for sure if she is the one who bought the sneakers, correct? Even so, all too often I have found from personal experience that just because someone complains that they don't have money, I've often found this is not the case at all. I have a sister like that. I listened to her complain for months about how her and her fiancé so badly wanted to get a house but didn't have the down payment etc. I felt had for her and ALMOST offered to help out until....I FOUND OUT THEY MAKE MORE MONEY THAN WE DO?!?! Heck my mother is like that too. By many standards my parents are considered to be pretty well off yet my mother has the gull to complain that they have no money. I have so many more examples but I think you get my drift. It's often not that they don't have money...it's how they prioritize their finances.

Second, why are you even letting her pick up late? If you have set hours, then you have set hours. Call her back and tell her you actually made plans tonight you forgot about and she needs to be there before 4:30. With a pay cheque.

I'm not feeling like this woman is very respectful, she has a lot of guts picking up late after asking to pay late. Just no.