lake How to fix a greedy relative?

My grandmother is very old and in a care facility, my mom has been taking care of her( taking her to doctor, taking care of her bills, etc.) for 10 years with no help. My Grandma took a turn for the worst, and now my Aunt( who can't even manage to come visit her) is now demanding to see all paperwork, etc., and says she'll be up here as soon as Gma dies to collect what's hers (and then some) yet, she refuses to come any sooner... any advice?there