It's a bug where "Ally with her" starts to show up before the quest actually allying with her against Athia. This might confuse people because in previous version this bug doesn't happen and guide only says that statement with Athia vs Gwen starts with that either siding.I can't remember if "ally with her" or have sex with her is the third item when you talk to her with less than 80% lust, either way have you selected that third item before trying to distract her? Though I have done this dozen of times, I do it on autopilot now, so referring to walkthrough to troubleshoot. It says you have to select that third item.
I also assume that Mira has told you that she can't teach you anymore about reading? (It proves that you have learned to read).
There are many bugs so far where dialogues start without the appropriate quests have started or people doing actions that are meant to only start with other quest or direction which MC have no started.
After church quest of Mira is completed.
MC telling Athia(after siding Athia) that a demon is sealed still under the church even though she escaped and Monastery quest was never started at all even though cart is waiting outside church to take MC there.
Mira not using holy symbol at night without ever going to Monastery as well.
Several other bugs like that exist or unsure Chyos himself changed such triggers for Mira but that still means bug for Athia dialogue.