Everyone does carry weight differently and appearances can be very deceiving.
Jessica isn't that tall, which by itself tends to make any weight gain apparent more quickly, but she's also large breasted and looks fairly short-waisted, so any weight gain is going to make her look heavier than someone with smaller breasts and/or a bit longer torso might look.
My daughter was a dancer in high school, and the school requested body analysis for their dancers, perhaps because of the tendency to bulimia and anorexia in the performers, or maybe it was just to stress the importance of nutrition.
My daughter was told she was overweight because her 5'4" frames was 140 pounds.
Your daughter is gorgeous, Kitschy. I'm 5'4" too and 140 is my happy weight.