Christians also get attacked by the devil because they are the devil's potential target. Mother inlaw has a troubled soul. The devil comes to steal destroy and kill. Forgive her because she does not know what she's doing. She's angry and she takes it out on you. Think proactively. Pray for your healing and restoration and forgiveness. Forgive her even though you have not done wrong to her. Surrender all to Jesus who will carry your burden. This is a journey, take one step at a time. We are praying for your salvation and redemption here. God hears your prayer.