Do you play on PC and can send me the save file from the www/save folder? Just one save file with the number of the saveslot in which you have the issue is enough. Then I'll take a look at what you're missing. It's hard to figure out otherwise. ^^
Do you have 70+ relationship with Vampire? Else I think what you're missing is the dialog with the spirit at the bottom of the north dungeon, the dungeon where you find Vampire. When you go up north by using a ladder on the first map of the dungeon you can access a different area. Go down the stairs there to eventually find an area with a lot of nature and animals deep underground. The dialog with the woman there is necessary to advance Vampire's events.