EDIT: Thanks to everyone's answers, including those people just getting to this question now. I just wanted to add a prefatory note that I have had some time to look back on this issue. Basically, I have learned a little more about how to pick my battles, and my daughter went on the trip, I contributed money, and she got a lot out of the journey. My particular battle picking involved deciding that for me, a certain amount of money was worth the peace of mind of not having to dispute with my ex over the financial baggage. I can totally understand how other people would feel differently. But I can see the light at the end of the tunnel with child support, and after that part is over, I will deal as much as possible directly with my daughter and leave my ex out of the financial equation. I was mixing up that money part with the reality that when a divorce happens with a child involved, there will always be at least some communication necessary with the ex, especially if the child is not yet an independent adult. I'm dealing with that as its own issue and trying to keep it separate from any legitimate financial concerns I might have about splitting costs with my ex. I hope this thread is still useful to others, but if the moderators feel it can be closed, I am OK with that, too.
ORIGINAL QUESTION STARTS BELOW
I am sure this must be a common issue, but for some reason I can't find a way to track it down via web searches.
Edited to update: Thanks for everyone's answers, including those people just getting to this question now. I just wanted to add a prefatory note that I have had some time to look back on this issue. Basically, I have learned a little more about how to pick my battles, and my daughter went on the trip, I contributed money, and she got a lot out of the journey. My particular battle picking involved deciding that for me, a certain amount of money was worth the peace of mind of not having to dispute with my ex over the financial baggage. I can totally understand how other people would feel differently. But I can see the light at the end of the tunnel with child support, and after that part is over, I will deal as much as possible directly with my daughter and leave my ex out of the financial equation. I was mixing up that money part with the reality that when a divorce happens with a child involved, there will always be at least some communication necessary with the ex, especially if the child is not yet an independent adult. I'm dealing with that as its own issue and trying to keep it separate from any helplegitimate financial concerns I might have about splitting costs with my ex. I hope this thread is still useful to others, but if the moderators feel it can be closed, I am OK with that, too.