Make a deal with him hun, get him to take the time off and spend time with his
LO otherwise, say there doesn't seem much point in her going up to spend xmas with him, if he is going to be working most of it. Then you know she will be getting the most out of her time up there. It will probably make you feel a little better about the situation knowing she is spending quality time with her dad, rather than jut being away from you if you see what I mean x