Unresolved Hurt from the past issues and post menopausal hormonal changes ,
thyroid issues might be few of the contributers for such behavior.
Diagnosis can be done only after seeing the patient.
Next Steps
kindly consult any psychiatrist near you.
Depending upon her present psychological & physical situation , counselling and medications can be considered.
Your Dr is the best person to take the call.
Health Tips
Be supportive of her emotion and pain. Not behavior.
(It must be painful for you to go through all this, let me know what we can do. If you feel okay, we can consult a Doctor... )
Try not to be judgemental about her behavior.
Avoid giving advice / solutions , it ll cause more pain.
Most importantly , your psychological health is equally important. Take care of your self.
all the best !