Hmm. Hana didn't move in at all (yet) and I have 0/4 of her points and 7/12 bar events.
But you are right - after searching for it by loading different save games, I finally found that it was Maria mentioning it, not Hana. The day (Sunday) before the day of the lingerie event Maria talked about it with the MC while being with on a date (asking her in the hotel room, MC and Maria then went to the Hot Springs). That date increased the affection with Maria to 20 (could be important).
Do you need a save game to look at the issue?
One other thing I noticed (but maybe I just forget it) is the kiss with Hana that Maria mentions in the bar just before going to the lingerie store. I cannot remember that kiss happen in the first place (maybe it's just an off-screen thing?). But I will try to replay the saves, it could be that I just overlooked it.