Is Ava hot yet?
Nope, nope, nope.
She still lacks her chin, her mouth receding into her neck.
Deformities like this, even if it's only the person who has it who notices it, can cause a great deal of psychological harm, and if they can be corrected, they should be.
When the hefty heifer was a little infant, and still covered by such things, her mother should've had it corrected. However, it's possible her mother had subconscious feelings of jealousy for the daughter, and kept her this way so the infant would grow up shallow, unhappy, warped, and selfish.
It is glaringly significant that of all the girls in her family, only the hefty heifer was home-schooled, all the others going to regular schools. One senses this was because the chinless wonder was--unfortunately, tragically--teased, harassed, and bullied by other children.