You are lucky to still be living together. My Girlfriend/Roommate often mentions that my H doesn't act like a man who wants out of his marriage. We have another friend who came home from work, her H was sitting at the table. She asked what was wrong and he blurts "I want a divorce." And while she was at work, he packed all of his stuff and had already moved out. She saw him a handful more times after that but it was for business only...separating money, taxes, household bills, etc. They didn't have any kids though. G/R is often confused by my H's actions too. He says one thing and acts another way. Crazy-ness.
Lots of women say they would like another baby, ESPECIALLY when talking about the birth of their child or children. I would like another baby when talking about that crap, but then reality sets in and after losing 60+ pounds and a boob job, that's not for me again. For sure. But seriously, I have friends with babies at just about every stage and I was the first to have a baby of all of us. When I'm holding my girlfriends 3 week old, I don't want one. Your daughter sounds like a riot.
Maybe the anger comes from guilt....guilt at how she's treating all of you and your all still there. Maybe she's trying to push you all as hard as she can so you'll leave and bye bye guilt...??
I think her wanting to see the C alone is a good thing. Don't know why, but I do. Maybe she's seeking advice as to how she can cross that bridge back home the best way possible for her.
