I'm doing the "Taste of Death" quest line and have brought back the monk in order to join her grisly coven but she just attacks me on sight (along with the rest of the Namira worshippers). This happened before while fighting with draugr but after a few reloads and killing the boss she would talk to me rather than attacking. At a real loss what to do, can't even kill her as she marked as essential - that might be from using the essential npc's mod though. Any ideas? Is it possible to use the console to set her to friendly?

Get some fortify illusion potions and a pacify or maybe calm spell that might be able to calm them down long enough to finish it.

Hmmm...it's an idea. I'll try that, thanks.

If your using mods, that would be a good place to start. Check online to see if anyone else has been having similar problems with the mods your using. If your an imperial, use Voice of the Emperor, should do the trick

Tried using a scroll of harmony and she at least said nice things to me about joining the coven while zapping me with fire balls. I suspect this is actually a bug in the vanilla game after a google search reveals even console players have had the same problem. The easiest remedy seems to be to wipe out the entire coven to gain the Ring of Namira but I'd quite like to join the coven. Oh, hobbitfoot, playing as a Nord vampire.