Do you have her in the habit of going to the bathroom before bed? I did that with my daughter, because when we got her potty trained I would let her sleep with a night time diaper, and then she just got lazy with that. So I just went cold turkey, and she only peed in bed like twice. What happened or what I realized right away was this, she needed to go to the bathroom before going to bed, and if she did get up to have something to drink, she would call because she was thirsty and then after that, I would have her use the bathroom. So we got to the point where she did not like to get up to go to the restroom in middle of the night, so she goes before bedtime and she does not drink anything in middle of night anymore.
I have heard of some kids doing this where they just sleep through the wetness, if she is not feeling the bed or sheets to be wet in the middle of the night then she may not feel them in any sort of coolness diaper or maybe not even with a cloth diaper.
I would try to limit her drinking before bed, if you can, give it a 4 hours before bed to be her last drink, and make sure she goes to the bathroom before she goes to bed, that may help get her through the night.
Good luck, I hope that something works...(I have heard of others trying to pin point when they go to the bathroom in middle of night, you can get an alarm clock for her and have it wake her up to go to the bathroom or wake you up to wake her up to go potty) Just another thought.