You could just lie about her grade. I mean, it's summer camp, right? Not a big deal. We lied about my DD's age by a few months so that she could meet the cutoff for attending camp with her grade-mates, and it worked out fine.
Alternatively, you could just call and explain the situation. I did that once with my DS, who wanted to stay one level down in soccer for one more session, even though he had just aged out of it. They said it was no problem.
Indeed, for things where size and coordination matter this summer, we're signing up DS for his grade he's in now. For things where maturity and thinking skills matter, we're putting him in his receiving grade.
The community soccer league has no problem with me signing up DS according to his age, letting kids play up and down as parents feel the kids are best placed.
