R.K.
She's not drinking very much. My kids have milk in the morning, water (as much as they need to refill) until lunch, milk with lunch, milk with dinner and as much water as they want in-between. Juice is really bad it's nothing but sugar try adding some lemon or a small (and I mean small) amount of juice to her water to give it a little flavor.
Edited: you didn't ask but it's not healthy to not drink water the body needs it. You didn't have to specify what she drinks when but you did and I am shocked to see juice and not water. I hope you mean no sugar added (there is still sugar in that and quite a bit!) and not sugar free artficial sweeteners are horrible. You really should at the very least water her juice down 4 oz juice 4 oz water.