If you are feeding a lot of greens, cucumber, bits of fruit, etc, it is likely that GuaGua will not drink because she is getting enough moisture from the fresh food. Hamsters are steppe animals which do not have a very large requirement for water. So if your hamster is lively and happy and eats her greens and other food, then I would not worry too much about her actually drinking water. Just make sure there is fresh water available at all times.