I'm just going by what we actually see on the screen. It's slim pickings for the white princesses, quite literally, they're all very thin. Cindy seems a tad bit more... robust, I guess, in her character model. Aurora's a rail, as are Belle, Ariel, Jasmine, and Snow White.
Obviously the thiccest girl in the Disney repertoire is Tinkerbell, but she's not a princess.