my son got braces when he was 12 years old and it worked out just fine for him. It will be a different time frame form person to person, he got his braces removed after 1 year and got some other braces he has to put on every night. It was a lot of pain at first , first 2- 3 weeks, after that he was fine, only every months he got them adjusted again and of course that hurt every time for a few days again, but he was being brave.... I don't know why people would advice against it, we was in Germany at that time and we had a good orthodontist , I don't know for here ,but there is a German orthodontist as well, probably cost a little more ,but maybe it's worth it.
they can advise you probably very good and then you and your daughter should think it over , if that's what you want or not.
I think it was worth it and my son thinks so too.