I see you're from Canada, so this might not apply but I'll throw it out there anyway. Cold tolerance in kids can be a real problem. I teach in 62 degree water and I've stopped teaching kids under 12 for that reason. Every one of the kids I taught that was 10-12 had issues due to the cold. I stopped teaching kids that young because I found that it ended up turning the kids away from diving. My son was one of them, but by 13 he didn't notice the cold at all.
The second issue is height - if your daughter is under ~5'4" a BP/W may be too large for her. In my experience, being shorter than about 5'4" is getting into the too short for a standard bp/w. There's probably someone out there making shorter back plates though.
The second issue is height - if your daughter is under ~5'4" a BP/W may be too large for her. In my experience, being shorter than about 5'4" is getting into the too short for a standard bp/w. There's probably someone out there making shorter back plates though.