The primary way this manifests itself is her proceeding a lecture berating her children for disappointing her by pretending that things that can't matter to an adult still matter to them because they haven't lived it yet by the modifier 'honestly.' 'Honestly' is verbal shorthand for 'I am very angry with you because you are wasting everyone's time either arguing or worrying about something that you actually know isn't really a problem because I have experienced it even if you have yet to. You are bad and should feel bad.'
It should be noted that this is why her parents have to be kept at arms' length during the kids' formative years. If they are not, Elly faces the horrible risk of Marian coming along and saying "Of course it's still a big huge deal to them! They haven't lived it yet! HONESTLY!!! Sometimes I think you only had children to have people to be angry with!!" and the horrible implication that she's a simpleton who never figured out that other people have different viewpoints by definition just breaks her great big heart.