She's probably priming. Chins will go through a prime and get new fur in.
If you feel up to it, you can comb her. Either get a chin specific comb (which are about $30 or so) or get a dog flea comb. Grab your chin by the base of the tail close to the body. Then hold them upside down or on a very slick surface that they can't get a grip on and struggle. I find that holding them upside down is best and then they don't struggle. You'll then comb them from tail to head, backwards of how you would comb a dog. This will take out all the extra fur. You'll want to comb in short strokes, like inch by inch, not in one big sweep.
It seems harder than it really is, you just need to get a hang of holding them by the base of the tail. I hold them with my thumb and two first fingers. Just make sure you're close to the body so as not to hurt their tail.
If you're near a breeder or a show, I would suggest going and seeing how they do it first before you attempt it so you don't end up with a bald chin from them slipping their fur.