Hi,A.,
Do a search through past Mamasource listings for the bedwetting topic. It's so, so common here and there are tons of past postings on it. And the truth is that yes, some kids are not fully dry at night until eight or nine or even older, and there's not always a lot you can do about it. You're already doing a lot of great things. I'd definitely go back to waking her late at night (after she's been asleep a few hours but you're just going to bed yourself) and taking her to the toilet one last time then. I wasn't clear whether you were still doing that or not. That has hugely helped eliminate nighttime wetting for my daughter.
Also, if you don't already do this, layer waterproof mattress covers alternately with clean sheets a few times (cover, sheet, another cover on top of both, another sheet, etc.) so when she wets you can quickly strip off a sheet and cover and have a dry set beneath for a quick return to bed. Most of all, remember that her bladder simply may not be mature enough yet for full continence all night; kids' bladders don't always keep up with the rest of their bodies, it seems!
And finally, if she has excessive, constant urination day and night and is also thirsty a lot, get her blood sugar checked ASAP as urination and thirst are signs of Type 1 diabetes. Doesn't sound likely here but it runs in our family so I want people to be aware of those indicators. Good luck.