So I got into her grandma's house and killed the Fleder, but the nun is no where to be found so I can complete the quest. Does she only appear at extremely specific times or something?
She should be outside the hospital around midday, I think she wanders by the main entrance and then stands in the garden but I'm not totally sure, she's definitely outside though.
I just finished the quest. I found information on the quest and read that she should appear around noon, but for some reason she didn't appear when I checked. I exited to the menu and reloaded, and there she was walking out of the hospital. Probably just another one of the small glitches the game seems to have.