Hi C.,
I had one like yours, even when I woke her ad helped her to the toilet she wasn't really awake, and sometimes almost fell off. She offered to sleep in the bathtub, but I always vetoed that. She started to be very embarassed about it, especially as sleep-overs began when she was about 8. We just used pull-ups, which worked most of the time, so long as I made sure I had the right size by weight.
When a sleep-over occurred, I'd call the mom in charge and explain the situation privately, though my daughter knew I'd do it. My request was that she have a private place to change, and that her things wouldn't be gone through by the other girls. Also that the mom in charge be prepared for disposal. They were all gracious, and she was never embarassed at a party, though she was anxious each time that her secret would be discovered.
Finally, right as she turned 10, it stopped. It took a month to be sure, but there hasn't been a problem since and she is 16 now.
Her sister stopped earlier, but did have a couple of breakthrough episodes later.
There are gadgets out there, but the bottom line is that she needs to outgrow it, and she will eventually. When I realized that my efforts to help her learn were adding to her sense of failure and anxiety, I stopped all the efforts and just helped her stay clean and dry. I had always told her that it was ok and that she would outgrow it, I doubled up on that, and treated it as a natural part of growing up. I also smoothed her way socially, as I said. She took it well and by 9yo was philosophical about it. We were both happy when she out grew it, but it had no longer become an issue to her.
That is my advice, support her until she grows out of it, and don't let her think that she is abnormal.
L.