M, I have been reading along a bit and just want to offer this up regarding the movie.
Sometimes we cause ourselves our own misery. Next time you want to do something like taking D2 for her first movie, maybe tell your W " hey I am planning on taking D2 to see horton hears a who on Sunday at ---pm, you are welcome to join us if you want"
Do not go into anything further than that. Do not discuss memory building with her right now. She is struggling between ending your marriage and working on it. Do not believe for a minute that by making memories or showing her value of family that this will make her do the right thing. She is not sure what the right thing is to do right now.
My biggest piece of advice for you, stop thinking that your W is logical right now. She isn't! She is confused and lost in many regards.
Did she take D2 to hurt you on purpose, probably not. IMHO, she probably did it to convince herself that she doesnt need you to make memories with D2. Testing the waters so to speak. Try not to put yourself in a position with her to have absolutely any expectations, because it is a double edge sword for you. If she does what you want her to, you see it as a baby step. If she doesnt do what you want her to, you see it as her trying to hurt you. There is no victory in this, understand?