has she got dandruff?
Otherwise,
white spots may be due to some infection aso. If so, doctor will prescribe you a cream to rub on the affected area....
Oooo.. i noe... its bcz of sweat tt mix wit water i tink... its advisable to dry ur sweat b4 u go bath/swimming... i hv it when i was in pri sch.. some kena on the body but i kena on the face.. bring her to see doc.. doc will gave med like cream or liquid type.. in mly the illness is called panau..