water woes

we've trained rachel right from birth to drink water....and normally she loves to drink water, every morning after she wakes up, she will drink about 2-3oz of water....then half an hour later take her milk. during the day, she consumes water quite frequently too. she has never rejected water until recently (last week to be more exact!)...
sigh... for some reason, she begun rejecting water......we normally feed her water through the bottle. but since she started rejecting water, we've tried all other ways to give her water. we used the cup, and i even took out a brand new bottle to fill it up with water and let her drink from there. initially she did drink from the cup and the new bottle, but after a while when she realise that it's also water in it, she also pushed it aside already! sometimes on good days she will drink water via the cup or the bottle. but on not-so-good days, she will totally reject. when that happens i have to resort to using spoon to feed her water.....sigh.
i am praying that she will stop rejecting water soon....