Why did we just move past that very big confession followed by "I don't know" and then just drop it?
Maybe Taika said something out of pocket, threw off Ao's train of thought, after which they might've been interrupted by Ao's boyfriend paying a visit, which could possibly have led to Ao starting on a new train of thought considering if taking Taika to school may make him less of a risk and, in a way, protect him, which, perhaps, is the most important thing to her right now. I don't know. Maybe some reason like that. We will just never know what happened.