Have u tried to give her more water to drink while fever?
if she doesn't like to drink water, boil some juice for her, ie 2 corns + 2 pears + 1 catty water chestnut + some 糖冬瓜 + half carrot, boil for 1.5 - 2 hours.
Or she can even eats those corn and carrot, still yummy. (actually if u don't put either one or two ingredients is still ok)