What should the husband do, if the wife is not responding

My brother's wife left him and his family in october while she was carrying stating that she would return for the abby shower due in December. Soon after she landed @ her mom's place, there is no communication with her or her family. None of them answered the calls made by us to them. Even when my brother along with my mother visitied them, She did not speak at all, inspite of my brother having a bleeding finger, no assistance for him was provided. My brother and my family don't know what has happened -- no big fights happened. They were married on APril 25th. 2016. she left in October. Even when the baby was born, they dint call my brother to let him know of the same, rather, they sent a message to my mother. When we went to see the baby also, she dint dint respond to us. Now, in APril My father died. Inspite of repeated calls and SMS from my brother, she did not respond. None from their family attended the funeral. None of us know what has happened because of which she is doing this. What should my brother do?