Again, she's going back to treating you like a child or an underling.
Just make up your mind to go with the kids and stay at the hotel whether she's with you or not. You are still in a partnership with her and she was the one who didn't give you a straight answer if she's going or not.
You can't change the way she wants to act as a parent. She has to want to do that along with everything else. But if she chooses not to, well that's up to her unfortunately. But hey, it's her choice.
Just be aware that she will continue to twist your words around to make you out to be the bad guy no matter what the subject is right now. You have to learn how to take what she dishes out and turn them back on her. She's going to be goading you into fights so you have to stop them before they happen and walk away if she continues. Warn her before you do so though so she can't throw that in your face.
In terms of talking to the kids, there is no "perfect time" to tell them. Tell her that you believe that needs to take priority and that as their mother, it should be hers as well. She's holding it off to come up with a story that would make her sound like the hero. You've got to cut her off at the pass.
Be active rather than re-active to get back the respect that she's taken away from you. Sometimes our WAS's can seem so selfish and condescending that they need a dose of reality every now and then. You do that by standing up for yourself.
Ask yourself...if this was someone new whom you were dating, would you let them treat you like that? If not, then why would you take it now?
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.