Reading through the story, you were in love with this woman for you to go against your family and marry her. You loved her when you said “I do and I will care for you in sickness and in health.” Your wife is sick mentally and you know it, it might have been triggered with a postpartum depression. The birth of a baby can trigger powerful emotions, from excitement to fear and anxiety. An extreme form of postpartum depression can lead to postpartum psychosis, all this can be treated with medication. But you mentioned her sister having the same problem, mental disorder probably runs in the family. Your wife needs you now, if you were in love with her at all this is the time to prove it. You are frustrated about her behavior, and she doesn't know she is doing this to you, she is sick and she needs help. Medically, sending her home will not help as much as living oversea. But spiritually, she can get deliverance faster but not the way you have cleverly sent her packing. Our Nigerian culture treat mental disorders like plaques instead of helping the one affected. A person abandoned and unattended is more dangerous than the mad person on the street. Mental disorder is not a short-term but it is also not necessarily permanent. Most mental disorder resolve after treatment with counseling and or medication, or simply the passing of time accompanied with prayers of course. Others are lifelong and cause ongoing problems for those afflicted and for their families. Mental disorder is a serious disturbances by definition, four out of ten leading causes of disability in the U.S are mental disorders – major depression, bipolar disorder, schizophrenia, and obsessive/compulsive disorder and many people suffer from more than one mental disorder at a given time. Some people just struggle for a short time and others are able to live nearly normal lives with regular medication, supportive counseling and nurturing from a loved one. Some will suffer from constant emotional and behavioral chaos, and the risk of violence due to severe depression, feelings of hopelessness, or aggression. Pray for wisdom in helping your wife, this is not the time to abandon her and the child. Bring her back home and get all the resources you can get to help her and let the prayers be going up at the same time. Your nurturing and sincere love and affection is a great healing tool. She needs medical treatment as well as spiritual help. I believe in prayers and miracles, and that's what you should be doing as her husband, don't blame her or her condition. Trust God in healing your wife!