how do you know she dosen't need the money though?
Generally people tend to live up to/over their means. Although she probably earns a lot from what she does, she also probably has large outgoings. Ok, so she could move to a smalle rhouse and have a smaller mortgage, but in truth unless we live in a studio, so could most of us!
Perhaps she has a work ethic and had already committed to the projects you mention before she found out she was pg? Don't get me wrong, she annoys the hell out of me, and i'm not defending her, just defending the right of mums in general to go to work if they want to/need to