Separation Agreement Signed

My wife signed a separation agreement 6 nonths ago in mediation. She is now, not liking the agreement that she signed and wants more money. We are still married, so she can stay on my insurance plain. What are the chances she can have this agreement overturned :?

If you both signed and notarized a separation agreement in the presence of a mediator, it is nearly impossible to overturn an agreement if there was no fraud or duress.

She can ask to have child support modified, but there are hurdles she has to overcome.