My wife and I separated in April. On Sept.2 she dropped our son off with me saying she could not take care of him anymore. Since then she has seen him 2 times and called him 5 times. She has moved out of county/state and has left no way for us to reach her. About an hour ago she called and said she was in town visiting her mom and wants to take our son for his winter break. I fear she will leave with him and not return. Is there anything I can do to stop her?