Well, the brown is probably staining around her mouth, and tear stains around her eyes/face. It is usually not the truth, tear stans do not come out easily, in most cases, especially not in one bath. You have to use special products to get the tear stains out, and this can sometimes be a pain. If you work on them, the tear stains may come out, based on the case. Tear stains are very common in malts, most do have them. Teething is a cause, there are many causes though. Good luck!
Anyways, welcome!
P.S. Is it a dark brown color, or just light, off white?
Anyways, welcome!

P.S. Is it a dark brown color, or just light, off white?