We have been pushing her to become more involved in school. The activity she has finally chosen will cost my wife and I $1000 just for the summer.
In hindsight, you probably can see how a select group of affordable activities should have been presented to your D.
Perhaps I've missed something, but if your W did not influence D to choose this expensive activity and neither of you gave the child financial guidelines........I don't think it would be fair for you to dump this on your W to tell D the expenses can't be covered.
If your W had shut you completely out of this entire situation, then yes, she would be the one to address the D. However, since both of you "push" your D to choose.......you should approach your D as a team.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!