I think her motives are obviously very skewed, so here is a plan to see where her heart is. If she is indeed trying to control things, then it is fairly easy to oust the behavior.
Skip the trip to the concert. Instead, take 20 bucks and a sleeping bag and go camping for the weekend. If you can't get a bud to go with you on short notice, go by yourself. Take a book or four.
If her control issue exceeds the financial, and I expect it does, then it will be obvious.
Have fun!
-NOPkins-
I will ferret out an affair at any opportunity.
-An affair is the embodiment of entitlement, fueled by resentment and lack of respect. -An infidel will remain unreachable so long as their sense of entitlement exceeds their ability to reason.