I don't have as much advice, because when I was that age I had super short hair because of similar problems. It wasn't until I was almost 9 and could brush my hair myself (and promised to do so every day) that I was allowed to start growing it out again. J also went through similar, and he still can't stand to have me brush it, but he's gotten great at brushing his own hair. But his is super thick and straight instead of fine and wavy like hers.
So perhaps try to get her started on brushing her own hair? A lot of tender-headed people I know find that is less painful than having someone else do it, and it gets her in practice for when she is older. It probably won't be sufficient, but it could be a start.
Other than that, I'm mostly in agreement with mamagotcha - experiment with other detanglers, work from the bottom up, and try to work in braids or pigtails. I've personally had more luck with plastic brushes than combs, but ymmv.
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I don't have as much advice, because when I was that age I had super short hair because of similar problems. It wasn't until I was almost 9 and could brush my hair myself (and promised to do so every day) that I was allowed to start growing it out again. J also went through similar, and he still can't stand to have me brush it, but he's gotten great at brushing his own hair. But his is super thick and straight instead of fine and wavy like hers.
So perhaps try to get her started on brushing her own hair? A lot of tender-headed people I know find that is less painful than having someone else do it, and it gets her in practice for when she is older. It probably won't be sufficient, but it could be a start.
Other than that, I'm mostly in agreement with
Sorry can't be more help!