The quest is called Road to Hamartia. Moira is inside the house and there are a bunch of villagers with torches outside blocking her. The doors are locked. There is a window around the back but it is blocked by a moveable barrier. How are you meant to get inside to her?
The villagers are marked red when you use Odins vision. You will have to kill one of the people that are attacking her house and they will all run away. Once they run the doors unlock and you will be able to rescue her and speak with her about the brew.