How do I enforce a prenup if my spouse contests it?

I am divorcing my wife and she is threatening to contest our prenuptial agreement. We wrote the agreement ourselves before we married and she knew exactly what she would get and what she would be giving up if we did divorce. Now she is claiming she didn’t understand her rights and didn’t know she could contact a lawyer to review it before signing it. I believe the agreement is fair and neither of us had an attorney so there was no advantage that either of us had over the other. What do I need to show the court to have this prenup enforced in the divorce? I stand to lose a lot of money and property if this agreement is thrown out. Does it matter that she didn’t consult an attorney?