It would do no good for Jim to come along and try to explain to his errant imbecile daughter that despite her belief otherwise, she wasn't a dangerous rebel and her mother didn't really reel from anything. I'm put in mind of a scene from one of the cross-overs between Law & Order and Homicide: Life On The Streets when Munch managed to read the FBI report on him and angrily denied his being summed up as the man he was: a noisy poser trying to give his mother a huge middle finger by pretending to be a Maoist. Since Elly wanted to think she was dangerous, she assumes that tame behaviour like wearing make-up kind of early and blowing Mommy's money on cute tops makes Becky the Anti-Elly.
What she never wanted to see is that April did inherit the family's jealousy, insecurity and belief that people who stand in the family's way are garbage people plotting their ruin which kind of gave Eva an in. Since April needs to see herself as being at war with everyone (owing to having that instinct reinforced by another moron with a bunker mentality), the poor deluded sap will always find an excuse to hate the one person actually trying to get her to not act like swine.