You lucky dog. It's nice that your sister is keeping it in the family. I would guess that it wouldn't be as hard to part with one's fabric knowing where it is going.
Good for you but bad for her. Why is she giving up?
My sister was working part time with disabled kids and she got an offer to go full time and decided she wouldn't have much time to herself to do her quilting. She also is burnt out on quilting and wants her time for herself to do other things.
One thing my Mom and Grandma instilled in every one of us is always have lots of fabric on hand as you never know when times get tuff your butt is covered!