What do you want? Have you filed for divorce? If neither of you have previously filed for legal separation or divorce, then yes, she can try to come back, file for divorce and take the house. Can she succeed? Depends on how good your proof and lawyers are compared to her "proof" and lawyers. At least get a consult from your local Bar Association. Most of the time they will give you a referral free or at a reduced rate. Hope it all works out for you.