Think it's a case of undiagnosed postpartnum depression? Some women can go wacko after birth due to this.
But it's glaringly clear that Brit Brit's bipolar or more. I hope she's at the stage where she's ready to ask for professional help.
Sometimes it'd take years before a messed up person would take that step and seek help.
Either way, her kids are better off without her for the time being.