Agree on the shoe complaint; she could update in that department, but I love her black riding boots. They look awesome. Otherwise, to me her casual style is fine. She chooses lots of nice sweaters and scarves and when she is not pregnant she mixes it up more. But it's tough when you are that far along.
As for the jeans, it could be that she is sizing up. When I was expecting I didn't buy the panel type; I just bought stretchy jeans and slung them low, and I wore a lot of black legging and knit pants as well as lots of dresses, skirts and shirts. It gets most difficult in the third trimester though - not sure where Jennifer is at now, but she must be in the third...