Regarding my wife health and activity.

Hi Dr, I'm working in an IT company and I got married 1.5 years back, My wife is also a relative to me. But her marriage got arranged and stopped before she marry me, After we get married, she was working in a software company, she slowly lost interest in going to work and she became abnormal day by day, she got anger very often and she got irritated for very minor problems and all. Later she started to behave different to me as well as to her parents also. She thought some one did black magic to her. Her eating habits and lifestyle got changed. Due to this, lot of fights happened between us and later I thought she is not normal and I left in her way, Now she is alone in home and she is not at all interested in any household duties. She is not interested in any activities and travel too. Sometimes she struggles to come out but suddenly she became demotivated and lost interest. Please advise this is due to any mental stress and what should I do to bring her out from this situation