Best treatment would be to find allergens causing symptoms and to avoid it...over the counter antihistaminics will be beneficial to you...Consult nearest allergy clinic for skin prick test and other modalities of investigations in which they will test you for various allergens and find out to what you are allergic...and they treat you with diluted doses of that allergen to desensitise your body to that allergen...good luck.

Sneezing n water from nose ,may be due to some allergens to which she is exposed to.like any kind of fumes from kitchen while cooking,or dust while cleaning the house or like wise u can give her any anti allergy medicine , ask her to drink more water , hot tea with ginger n some Vit. C tablet daily to increase her immunity