As crazy and vicious as she is behaving, you need to take every possible precaution to protect yourself and your interests:
1) If there are any joint accounts left, withdraw 50% now. Check with your lawyer, but I believe so far as you only take 50% you would be ok.
2) If you have any joint credit cards, see what you can do to separate them. If there are credit card debts, you might not be able to get your name taken off until they are paid. But if there are joint cards without balances, see what you can do to separate them - you don't need her running up debts that you will be responsible for.
3) Do NOT EVER go to the house without another person in tow. You need a witness to testify in your behalf if she makes further accusations. NEVER BE ALONE WITH HER AGAIN.
4) Check your credit. Whacko spouses sometimes do weird things financially - make sure she hasn't taken loans out in your name etc.
5) Family can never be counted on - blood is thicker than water - BUT if you have a good relationship with her family, you might appeal to them to pressure her to retract the false charges. This would ONLY work if you have an excellent relationship with her family and they love you and would never believe her.
So sorry you are going through this, but she IS telling you who she is, isn't she??? Sad.