It so happens that there is a third annoying habit that first came into view when she wailed idiotically about where her baby went when Lizzie started to develop signs of a personality. To her, the horror of being talked back to and being walked all over by children who actually saw themselves as people in their own right instead of extensions of her will was being inflicted on her all over again. Why do her children hate her and reject the love in her heart by acting as if anyone else but her was allowed to define who and what they are? They should love her and admit that teachers, other children, the media and they themselves are not fit to decide who they should be because to disagree with her in the slightest means a total rejection of her and total hatred of her because Mommy is as mentally stable as Betty "Psychotrooper" Cooper.
Apply that sort of bat-shit insane thinking to a naturally timid child like Lizzie and you'll see why the Hell she was always the blandest, least interesting person in her circle of friends. Everyone else had a distinct personality and a hook to make them compelling characters. Liz was a bland pile of nothing because Mommy can't deal with anything like conflict. Hell, Elly managed to browbeat her way into stealing Liz's happy ending. Instead of coming into her own and becoming someone interesting, she was saved from that to become a bland copy of her gutless halfwit mother and wound up liking it....thereby making her the Winston Smith of the funny pages.