the bottom of her belly looks like it's about in line with her bum crack, and if you follow your bum crack around to the front you will find your pubic bone. The shadow you mention, in my opinion, sways more towards pregnant belly since chubby bellies don't have such a sharp indent, while pregnant bellies to. Not to mention there is significant variation in where women carry their babies.

Really we just need to find more photos of her.