C.B.
Tried one with one of my sons. No luck. The thing is, is that sometimes the body inside grows at a different rate than the body outside. I am not kidding when I say he still had issues now and then when he was 12. For the most part it went well when he was going to start school. But he was such a deep sleeper that sometimes he couldn't wake up in time.
So keep it in mind that it isn't always a matter of by a certain age they should be 'trained'. Maybe being grateful for daytime success would be good, because if that was a problem, there'd be a lot of self esteem issues if accidents happened at school.
Try getting through to her that as soon as she gets out of bed she goes to the toilet. Immediately. And get mattress protectors. Use underpads.