The stupidest decision of all, of course, was to buy a business where she'd have to work with the public. As we see time and again, Elly is quite simply awful at dealing with the public for the same reason that she's an awful parent, awful wife and awful daughter: she's a brittle idiot who can't take the rude behaviour she dishes out to other people. What's worse, she's the avatar for someone who looked at all the people shopping for Ruth's bargoons and wrote them off as being akin to a bunch of stupid raccoons paying good money for someone else's meaningless old crap. The same arrogant, dismissive disrespect for the people attending the sale re-emerged in this effort in which she makes no effort to help some poor sap who assumed that a book store owner would actually bother keeping up with the news. Said woman also probably assumes something else that she shouldn't in that she assumes that Flapandhonk is going to make sure that her inventory doesn't sprout legs and walk out the door. The dumbass with the turnip sprouting out of her stupid face was so glad to have someone flatter her that she let a lying jackass rob her blind. What bothers me about Elly's talking about keeping an open mind is that it was so open, her teeny little brain fell the Hell out.
Fortunately for all concerned, the effort of having to think further ahead than the next five seconds proved to be as heart-rending and unfair a trial for her as it is for her children so she moved from befuddled employee to inept owner to insane and domineering landlady. Eventually, her crappy diet will kill her and Moira can be free of her stupid and useless interference.