Oh, that's so cool. I'm glad you are enjoying your kids and that things are still getting better. It seems like you and your wife are finding empathy for each other again which is so important!
I haven't done MS yet, I stick to FB. I think that is so good that she is letting you into that part of her world. It seems like it was her retreat from you before and something private for her and now you're a part of it! Maybe she is using her tantrums to get your attention and test you to see if you respond in a negative way, or to see if you have gone back to 'old ways'.
I'm so pleased that things are still going well. I think a tinkerbell and cars party sounds ace!