That does seem alot of water, but if she isnt offered anything else i dont know...DD1 thought it was a huge game waking up and calling out for a drink for a long time, she still does occasionally.
has she lost alot of weight lately? or had a bad bout of thrush? Generaly feeling lathargic?
if she has any of these other symptoms get her to ur GP for a BSL for type 1 diabetes.
even to put ur mind at ease, its a very quick and easy test.

After going through it all myself whenever i hear of anyone drinking excessivly im like, go get checked!!!! specially little ones.
probably havent helped and jsut made things worse...sorry hun