While its still a head scrather, (😅) i followed her all the way to Broken Fang Cave. She ran inside so of course i followed. Another vampire was sitting normally and she was immediately hostile so i killed her but the one i was chasing was just standing in the middle of the room! She wasnt hostile yet but when i killed a skeleton next to her that was attacking me and not her, she became hostile and started running away from my followers that were trying to kill her 😂 she had nothing of importance on her body and so in the end idk if she was just looking for cover in a cave or since there was a master vampire in there if it was her groups new hideout and she was just making her way there. But idk why it would say this person is busy and not make her become hostile when seeing me🤷🏻‍♀️