If she has real friends that "get her" in the regular classes and she wants to be there I see no harm in it. If she is getting by and happy, I certainly wouldn't advocate medicating her so she can be pushed to achieve more academically.
Dd has generally had a hard time socially in elementary. She had "friends" in the non-accelerated classes but she really felt like they were acquaintances more than friends and she put on whatever it was that it took to make them happy. She was rather dissatisfied with the relationships and felt very, very lonely, though. In the GT/accelerated groups, I'd say that it has been a better fit but still not quite good enough. She still doesn't feel like she fits with the other kids, but she does feel like she fits better.
I just wonder if she might have somehow fit with the average kids if we had thought that's who she was, though, and she hadn't had an older sister who was so obviously not average. That's an alternate universe, though
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