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Its not strange at all. Even in real history, women were not educated about sex until just before their weddings, and that always by a close female relative or confidant. Her trusted maid was sent away from the house before Elsa got married so the only one to give her the talk woukd be the stepmother. It would be part for that evil b*tch to purposely keep the knowledge from Elsa, so that she would be completely in the dark on her wedding night and end up terrified and in pain when she actually went through it (especially considering that Rolf was reputed to be a cruel beast of a man). It would be yet another form of abuse that would scar Elsa even more. When you think about it like that, it's not surprising at all.
the only thing that has stuck with me thats really pissing me off is the fact thats she asked how babies are made BITCH are you fucking DUMB
guys i acc love her tho its just.... that was such an ick omfg