If you have her income imputed already, it should cover all purposes (offset CS and s7 calculations).
As for summer camps, perhaps you could put a cap on amounts?
"Summer camps will be s7 for any week in which both parents have to work and are unable to care for the child. Should a summer camp fee exceed $X and the parents not both agree on enrollment in advance, any amount exceeding $X will be covered entirely by the parent whose access week it is."
That way, you only have to pay for summer camps that are needed because you are both working, and if one parent chooses a super-expensive summer camp, the other parent isn't on the hook for any part of the fee that exceeds a reasonable amount. You could choose X to be an average summer camp fee amount, or the max you'd be willing to pay, etc.