Ava was homeschooled?
Yeah, and her sisters weren't.
One quite reasonably assumes what happened was that the heifer was mercilessly teased and taunted as a child by other children--something by the way I never endorse, but it happens--because she has no chin; her mouth melts down into her neck.
And so her ultra-left-wing mother home-schooled her.
It probably wouldn've been cheaper and less hassle--and considerably less emotional damage done--if her mother had done the right thing right at birth, and had a chin built on the infant heifer.
But as Sigmund Freud pointed out, sometimes a mother hates a daughter, usually out of jealousy, and it could be that the heifer's mother wished the heifer to be wretched and miserable, and so left her chinless.