And cue the men believing that they've got some deeper understanding for what can happen in a woman's body and mind during and after a pregnancy.
Is it something that should be excused? Of course not. Is it entirely possible to be pregnant and not notice? Absolutely. Is child birth psychosis a thing? Yes. I can't imagine that a mentally stable woman would've reacted the way she did, since other women having given birth "out of the blue", didn't react the same way. Is it possible that she's just a selfish, horrible person? Yeah, but it seems like a bigger stretch than mental illness considering even psychopaths often know what they can and can't get away with in the eyes of society.
http://www.oddee.com/item_98904.aspx