Rachel: I think she's ring sour.
She likes jumping, but not that much. She likes jumping where she's in charge, and not working.
If you think about it, Summer was making her work harder than she ever has in what? A few years?
I'll be taking her out on the trail 1/2 times a week, and just taking her out. Not making her work in the ring. (If this is okay with you, of course)
Honestly though, it kind of makes sense, and it's always worth a try,