Challenging Settlement Agreement

My wife and I signed and notarized our settlement agreement 12/19/2009.
She is now threatening to challenge it with her defense being impaired or under duress at the time.
She certainly was not at the time of signing but does have a history during periods of that year
of addiction overdoses of Ambien and detox rehab treatments. 12/21/2009, 3 days after signing,
she was taken to hospital for evaluation after I suspected impaired and deeply depressed while in care of our son
while I was out of town. She seemed incoherent on phone. Didn’t know what day it was.
She was released clean and fine from hospital immediately after evaluation.

Will the court even listen to this case?

If so, any chance of her succeeding?

What if any are the statutes of limitations on this?