Sorry if my comment didn't help. I thought that, in order to make the second expansion of Bareshade, you needed the fourth heart with Bernard, and in order to start the Bareshade expansion you needed his third heart. Every time that I visited Bernard by night to obtain his third heart the werewolf attack triggered, so I wrongly assumed you'd already completed that part.
I assumed that you knew, but now I'm not sure: do you know that in the game there is a questlog by clicking one of the icon in the bottom left and after in the top left?