Can She Pull Out of Our Marital Settlement Agreement?

My wife had an affair, wants a quick divorce, and get re-married as soon as possible.  She signed a very generous (for me) marriage settlement agreement.  Due to her emotional problems, I'm worried that they'll breakup before they can get married - 6 month waiting period.  Can she pull out of the MSA after it's been signed and submitted to the courts but before the 6 month waiting period is over?   – Dan