What if I'm thinking of refusing to buy my little sister an expensive gift?
Why wouldn't you buy her an expensive gift?
That would be money lost. I don't really care about her
Even if you have a poor relationship with your sister, you are still family and giving gifts can symbolize that. Perhaps it can be a move in trying to reconcile, but in the end giving and expecting gifts it not always expected.
She's just asking for attention.
It's understandable that you don't want to put the money out for an expensive gift. Honestly, she should not be expecting an expensive gift from anyone as everyone has a unique financial situation.