Karen,
I have to agree with what some of the moms have already told you. Start the bedtime routing earlier. Bathe right after supper or soon after, and before bath put her on the potty. Then start getting her in bed at 7 or earlier.
That way she can keep getting up and peeing or whathaveyou every 30 min or so as she does, and you tell her she has to go by herself. Now, if she can't go all by herself, then you might want to invest in a little potty chair for night if you don't already have one. (You might even consider putting it in her room. I know that sounds icky, but it keeps her from running all over the house, you can always duck in there after she passes out and take care of it.) Get her a night light.
Now, as far as putting her to bed that early, this is where you have to think about black-out curtains if the light of dusk is keeping her awake.
And make sure she is getting a good nap in the afternoon. It sounds strange, but napping helps most kids get better sleep at night.
Make sure she's getting lots of fiber too, this will help her pass anything she needs to during the day or afternoon instead of feeling like she has to go at night.
If you feel she is staying up because it's fun or because she's thinking she'll get more time with you that way, you have to show her this is not the case.
And be firm. Bedtime is bedtime. But understand that when you're potty training, you have to prioritize requests to use the potty over anything else. That doesn't mean, however, that those requests have to disrupt your entire schedule or take longer than 10-15 min. or that you have to be involved in every single trip to the potty.
This will get easier, trust me. And don't let her sleep late as a result of this nighttime situation. This could only perpetuate the problem and continue to slide her natural bedtime later and later.
I put my 3 year old in bed by 7:30 or 8:00 at the latest most days. That way even if he spends 30-45 min talking to himself in the dark I know that he's still getting plenty of rest.
There is no harm in putting her to bed starting at 6:45 or so. This might mean that you have to put dinner earlier or bathtime earlier, but if you can get her to sleep by 8:00 or 8:30 then it'll will all be worth it, and you can get some much needed recuperation time.
Potty training is TOUGH, and you need time to have a little quiet and recharge, and it sounds like right now, you're not getting any of that and this is only adding to your stress.
Remember that she's only going to go through this once, just like she'll only learn to ride a bike once. These times pass so quickly and then they're gone, and we have to get the most out of the short time we have that our children are young.
Take good care of yourself so that you don't go insane and miss out on all the good that is around you.
I hope this helps.
C.