Ok, some cats prefer fresh or running water. Try running some water in a sink.
Why do you think she isn't drinking water? Cats aren't like Dogs. You don't have to carefully monitor and watch them. You show her where the litter box is, then you show her where the water and food are and that's about it. The rest is just teaching them not to claw up the sofa or jump on the coffee table.
If the cat doesn't appear to be drinking the water you put out, then shes getting water from somewhere else.
---Andrew