You nailed it Tim
She has this TV career and has a little one on the way. Just a guess here, she doesn't have the time to listen to Bennett, Ingraham etc, etc and be on the cusp of all the issues. When the pitter patter of little feet arrive, that time to listen may be even less. But more importantly she showed great courage standing up to Rosie.
I don’t think “lightweight” is the right word. But I do think she is a neophyte in the world of political discourse. She’ll do fine as she starts to do more research and pays more attention to the issues. I think back to how reactionary I was when I first started following politics and, actually, it was having babies that made me more politically aware. When you’re home all day w/o adult conversation, talk radio becomes a life line!