I love the "holding pen" analogy for the camps. My DD is the same, needs advanced for the mind, not advanced enough for the social w/ older kids, does poorly with masses of kids.
Do you have a small local nature center that does classes or camps? Often their classes are smaller enrollment because if they wander around the trails they want fewer kids, and the kids tend to be more quirky or have strong passions (like a boy DD met who is super interested specifically in carnivore plants...) We've lucked out in that the instructors tend to be quite intense and caring themselves.
My DD has always done very well with these, also if you have a botanical garden.
The "popular" ones usually aren't the best for DD, even the zoo and a popular science camp at a local college. Mostly because they're just...popular...and they get the "holding pen" types.
