I want to give an answer that takes your daughter's physical and emotional needs into account.
It's probably not something she can will herself to stop. Sounds like her body isn't yet producing enough of a particular hormone that reduces overnight urine production. This comes with physical maturity, not conscious control, so rewarding her for not having to pee probably wouldn't make a difference. According to pediatricians, it doesn't have much to do with drinking water in the evening, and going to bed thirsty wakes up some kids (it does me, too!).
It's fantastic that she is waking instead of wetting the bed, a definite sign of her body maturing. You might consider putting a potty chair in her room, with a small night-light, so she doesn't have to wake enough to get to the bathroom. If she can learn to manage that by herself, then she may stop calling you for help. I'd also be inclined to help her find a cuddle-mate (stuffed critter) to keep her company during the night, if she doesn't already have one. That might help her settle again.
My mom was very strict about her night-time expectations for me and my next two sisters. We were not allowed to call her during the night, no matter what, starting at early potty-training. This didn't work at all for sister #2, who was a bed-wetter until around 6. Parents used to interpret this as willful or lazy misbehavior, so she was in trouble for this every day – so sad. I remember needing comfort during very long, cold, lonely nights, but was too afraid of my mother's wrath to call her. My granny moved in with us when I was about 4.5, and she made a secret pact with us kids that we could creep into her room if we needed anything, even just a bit of reassurance. Until my mother found out and raised holy hell, just knowing comfort was available helped me relax and sleep more easily.