Did you offer any suggestions of things she could buy you? Cash doesn't count because mumblereasons. It sounds to me like your sister acted poorly, especially in getting your parents to contribute. But did you make it easy for her to act well?

I too would prefer simply receiving cash, but I've accepted that that's not happening, so I have an Amazon wishlist. It mostly has books and graphic novels. Graphic novels in particular make a good gift for me, because they're often a little more expensive than I'd like to spend on them myself.

(I feel like some people dislike even buying presents from a list, but you can at least suggest categories of things.)