I think while money is certainly a key issue, it appears it bothers you more that she makes these decisions, then informs you, then asks for help.

Tell her it is great if SHE wants to sign him up for camp, but since you were not directly involved in the decision, you feel paying for the camp should be up to her.

And I cannot understand why you pay for someone to take of the house for her.

I know we all have trouble setting limits and boundaries because we think if we are nice, the WAS will see this, but it usually has the opposite effect.

As Michelle says, ask for what you want.