You have had sex with her right?
It doesn't trigger on the same visit you get the horse from her, she has to leave, Grant has to come and go, then on her next visit she should tell you she wants to talk. You can have a drink with her, but make sure you ask her about what she wanted to talk about. Or you can just go into her room when she is standing in it at midnight. After that it will take almost a week, (math is her remaining stay, then the break between her and Grant, Grant's visit, the break between Grant and her, then she should arrive, but doesn't) at that point go into the tavern when it is open.
I am wondering how you were just stuck between steps three and four, but now seven. A lot of this game is patience and repetition, lots of times stuck just means you haven't waited long enough, or repeated something enough times.
(I am not trying to be condescending by pointing this out, it is more from a warning that the Trip to Kirlic is a giant pain in the butt quest, because it has so many scheduling conflicts and built in staggered wait clocks. You are almost there, just another week or two until Ophilia is Pia and ready to cover Kate's shift.)