I think it's great that she is such a big water drinker. Kids are so dehydrated these days because of salty snacks, sodas, and salt in processed foods. There's not much of nutritional value in juice, so if she's not drinking that, it's good. You could try a good hydrator like Innergize from Reliv (available in different flavors) that you get from a distributor the first time, then you can place orders on line. You mix it with water, and it increases the absorption into the cells, where it's needed, and so there is less to pee out. This will probably help her feeling of being dehydrated while still giving her the benefits of all that water. I can help you with more info - this is a patented product so that means it is safe, effective and unique - there is nothing else out there that matches it. There are some phenomenal stories about what has happened for people. It is much more effective and also doesn't have the junk in it that Gatorade has, for example.
I think the other posts are absolutely right - she is not waking up with the "full bladder" signal to the brain. She's not ready to be dry all night, and there's no way to rush it. "Training" just isn't possible if the brain-bladder connection isn't developed. I went thru this with my son for many years - tried everything from alarms (don't work, make everyone miserable) to waking him up to pee (no one's sleeping, his REM sleep was disrupted) to actually putting him on medication at age 7, which he needed until 12. I'd hang in there with your daughter for the time being. If the pull up is holding her, great. If not, you can maybe add one of those bladder control pads to it if it's not too bulky.
If you want more help with the feeling thirsty before bed, let me know. Good luck.