Found: Girl works at a library of the Brothers Grimm and finds loads of objects from the fairy tales

I read this 3-4 years ago I think. Main character works at some sort of library, she finds this room with objects from the original fairytales of the Brothers Grimm. I can't really remember anything else but I think someone starts stealing them, or maybe the main character starts stealing them? If anyone knows, please help :)

>1 hannah4188: You're probably thinking of The Grimm Legacy by Polly Shulman.

Touchstone: The Grimm Legacy

It is- thank you so much!