Harridan Praecox: Meet The Teenybopper
One of Elly's less endearing traits is her need to force her daughter's into wearing something she wants to see them in. My guess is that the source of this is her need to scratch an itch and also avenge a childhood trauma at the same time. Given her love of schoolgirl chic, it seems to me that Elly spent most of her young life envying prep school girls because she loved the way they were made to dress.
Also, her wanting to live in a should be world where she can dress how she wanted, popular girls be damned, tells me that she was a self-made outcast because she wanted to dress to not fit in. No one was going to make her conform to a norm unless that managed to bother a mother who refused to be scandalized.