There is nothing at all wrong with this bird. She is not the result of a frizzle x frizzle, she is not a naked neck frizzle and she doesnt look abnormal in any way, shape, or form. She looks to be an older hen, and she looks to be moulting. The feathers missing from her head are more than likely from being with a rooster who was an aggresive breeder, and from moulting. Her comb is very large and lopped, which is typical of older birds. I think you have nothing to worry about, give her time to drop all her feathers and get them back and she will look good as new. The other frizzle pullet you have, is AWESOME. Her color is amazing, and she is just an all around nice bird. I have been looking for decent Red Cochin or frizzles to breed, and wish I would have been so lucky to find a bird or two like her. Very pretty.
~Casey