Unless the additional legal fees are a big issue here, I would chime in agreeing that this is one I would probably try to put my foot down on.
Pettiness and rudeness in your daily interactions there is not much you can do about. When she sets out to purposely sabatoge your alone time with the kids, and then threatens you with legal action unless you yield, well I say it's time to say no.
I'm surprised by your lawyer's response. Did you not just have your wife and her lawyer in a court room accusing them of blackmail or intimidation recently? Why would your lawyer be so quick to back down on this one?
I'm sure you can document when you made the arrangements for your trip, and surely they are before the dates on which your wife planned hers. For the life of me I cannot see how a court would tell you to cut your short trip because there might be a snow delay that impacts your wife's trip. Isn't that just a luck of the draw type event?
As I see it, there is nothing for you to lose on this except the cost of arguing it in court. Her behavior couldn't possibly be much worse than it already is.
One last comment that I hope won't offend. I would personally be careful about the number of personal message interactions with available women on your fb page. I'm not sure if it could impact your still pending legal proceedings or not. Not even sure if the women who have written are single women or just family and friends, but given your wife's current state, I wouldn't put anything past her in terms of trying to bring trouble to you.
One thing that I would always be quick to stand firm on is any effort on your wife's part to negatively impact your time with the children. ANY person standing outside your situation would easily see that this is nothing more than vindictiveness on the part of your wife.
Stay strong my friend.
Blessings,
Bill
"Don't tell me the sky is the limit when there are footprints on the moon."