I’m not aware that there is a high transfer rate for northern girls. I do know a couple girls who dropped their sorority after freshman year. They enjoyed the experience, made a lot of friends, but decided it wasn’t for them. I also know a couple girls who chose not to rush freshman year, changed their minds and joined a sorority sophomore year.
The sororities at Alabama are HUGE. With such large groups, you’re going to find a lot of variety. Even with girls going to the house that best fits them, that doesn’t mean the girls in any given house are all alike. I don’t think anyone is going to have to fundamentally change who she is to make friends with sorority sisters. The cost is another issue - sororities aren’t cheap at Bama.
There’s nothing wrong with your daughter going through recruitment to meet people and see if sorority life might be something she’d enjoy. If she finds a group she wants to join that gives her a bid, great. If not, she doesn’t have to pledge, and she’ll have met a lot of girls and made some friends in the process. And if she decides not to go through recruitment, she’ll be in good company as well more than half the girls at Bama aren’t Greek.