People like Ashley can’t have “average” kids because they are not really full people in her eyes. They are extensions of her. This is why she’s obsessed with who they look like and how they look. If they are average then she is, and that’s simply not possible.
I reckon it’s partly why Alf is a disappointment to her. And why she has to work so hard to prove why he’s exceptional (the kindest/gentlest boy with his doll and pram, the best at numbers, the best swimmer, she was even adamant he was advanced with language until that became clearly incorrect).
All these things he is great at are because of her: she decided he needed swimming lessons, she gave him the iPad to teach him numbers, she’s been teaching him to be kind and gentle.
She never talks about WHO he is, just how he is behaving and performing.
And when he doesn’t live up to her impossible standards she is sneering about him.