Dehydrated balls often look/feel wrinkly, but its hard to tell with a dark pic, especially when they have a bad shed and skinny. But that is my guess from what I can tell.
Definitely use up the fuzzies, it won't hurt her. And judging by her size, she shouldn't have any problem with small adult mice if you can't find rats. I'd give her a few days to digest, though. Set up a 5 day feeding schedule. I would call local mom & pop pet shops for feeders. Most of them carry rats and feeders at such places are usually a LOT cheaper. To give you an idea, I have never paid more than $0.25 a piece for fuzzies the size you got. I bet you paid more than $10 for a box of 6 of them, huh? PetSmart is a rip off.