Seriously.... What is this "contract"? Where do you live? Is it in the United States?
Was it entered before a domestic relations court (or any court)? Does it specify penalties for violation of the promises/covenants made therein? If the answer to both of these is "No", then there is little she can do if you "reneg" on the contract other than to stop performing whatever promises she made.
I am not a divorce lawyer but I AM a lawyer (and blessed to be pretty spectacularly good one, in all modesty) and I have NEVER heard of anything like this outside of a divorce decree. Never. And i have been asking around since i started following your thread.
You need to get this figured out pronto and get it put to bed (or, preferably, incinerated) PRONTO... because it is really effing you up and definitely interfering with your ability to DB.
I live in the US. It is not part of any domestic relations court. It is an in-house separation agreement. There is a warning that if either one of us breaks the agreement we can enforce it. It is a notarized document as there is no legal separation in my state.
I went over it with a lawyer and they said it is ambiguous, so yes, I will put it to bed.