Only time will tell. You could get a flea comb and do a light grooming, dust her and let her settle in. If the fur is matted and in clumps, and not mowed down, then probably just hygiene issues from no dust. If your careful you can softly pull on the clumps. The hair should release, as chinchillas have a defense mechanism against predators, where they slip fur. Sometimes I have to do this to one of my girls who always gets small clumps around her back side near her butt.
Oh and you probably already know this, but if someone reading it doesn't good idea to quarantine her away from your existing chinchilla. I generally wait a month before anyone goes into the chin room. If you have a scale, can't hurt to weigh her also, and do so once a month to get an idea of what her normal weight is, to ensure you pick up on anything if she ever begins to loose weight.