Mary Stolz’s 1975 Cat in the Mirror is a standalone young-adult novel.
Erin Gandy is a grave disappointment to her mother Belle; she is deficient in the feminine virtues appropriate for women of her class. Neither pretty nor popular, Erin might well one day end up an academic or worse yet, a feminist. At least Erin can turn to her schoolmates for solace. Or she could if they did not despise Erin even more than her mother does.
Spoilers for a book more than forty years out of print.