My ex ask me to agree to allow her to take my child to live over 400 miles away because she wants to accept an internship for cooking. She went to a culinary school in our area. She wants me to agree to letting her take my child with her and I would see her only for a month in the summer. Presently I see her 2 to 3 weekends a month. She has threatened to go back to court to get what she wants. Can she have the agreement we made in court changed to accomdate her wishes if I don't want to?