Is she shedding/molting at all? It's possible that she's pulling out the hair that she's shedding off. Has she put all the hair on one place, like in a corner, or is it just floating around everywhere?
I'm not very experienced at this (actually, I'm not experienced at all), but since no one else is telling you what you need to get ... You'll need a nestbox, and, if it turns out she is pregnant, I highly recommend taking her to a vet so that they can give you some advice and check if they think she is pregnant aswell.
Since the rabbit was just sort of handed over, I'm guessing that they were not fixed, and therefore there is a risk that she is pregnant, especially if they were left alone together. However, relax, it is possible that it is a false pregnancy, and, even if it isn't, she could still get through the pregnancy alright.
If she is pregnant, see if you can find enough knowledgeable people that would be interested in buying the rabbits, or that you have at least six or so spare cages. (I've gone blank, and can't remember how many kits are generally in a litter).
Good luck!
Rachel.
