I'm homeschooling DS9, but DD7 has been going to the local public school. They are such different kids that I'm not sure we'd ever find a B&M school that would be a great fit for both of them.
I feel the same way about DD fitting in at school better than her brother. Girls (in general) tend to fit in better, but that doesn't mean the school is a better fit for them. I hope to pull DD out of her school in the next year. Not because she doesn't appear to fit in (because she does, sort of), but because she could do so much better in a different environment.
FTR, the only time I was in the same school as my sisters was my last two years of high school, when we moved to an area that only had a single K-12 school. Before that I was in completely different schools from them. I'm sure it was a PITA for our parents, but they made it work.