Hopefully you have a properly made and executed separation agreement and you have included it in your divorce. If you have done so, once the judgment is granted and entered you may sue her on not following ther terms of the separation agreement. I strongly advise you to consult with an experienced divorce attorney near you.
Schedule an appointment with an experienced divorce lawyer to go over the separation agreement and advise you how to enforce it. You may need to sue her to enforce the agreement.
If this answer is helpful, then please mark the helpful button. If this is the best answer, then please indicate it. Thanks. For further information you should see an attorney and discuss the matter completely. If you are in the New York City area, then you can reach me during normal business hours at 718 329 9500 or www.mynewyorkcitylawyer.com.