That being said, it's easy to see how she might appeal to Elly; to the unwary, she does give off the impression of being far more with it than she actually is. My guess is that the Elly who spent most of the Settlepocalypse sharing war stories with her best friend still thought that the destructive fruitcake was witty, charming, intelligent and all around good people. The problem with that, of course, is that Connie is not only a saboteur friend come to give bad advice out of a need to have company feeling pointlessly miserable, she's also something of a parasite.
In the hands of a better writer, the same Elly who was reevaluating all the decisions she'd made as a parent that led Liz to disentangling herself from Anthony would notice a pattern: a spindly, frowning, near-hysterical idiot in eyeglasses was there at every turning telling her things she wanted to hear instead of what she needed to. What's more, any attempt she made to float the idea of sanity was shot down and accompanied by an incoherent rant about how people were trying to keep her down on her knees by making her behave like a human being instead of a swinish clod.
Now, I'm not saying that the spell will ever be broken one hundred percent or that it'll be quick and painless; what I am suggesting is that without John there to be the sufferer whose presence means that no one else can get better, Elly might start taking Connie's advice with a grain of salt.