I have a problem with this quest too.
I originally got the fake branch and gave it to Corrina with the other stuff. Got the plant from her garden. Tried to do the summoning. She gets killed and the quest fails. Tried it a few times then got fed up.
So I reloaded and went off to do some other stuff. I now have the real branch but when I go back to corrina I can't give her the real branch. There is no dialogue option.
The fake branch is in the pentagram and I can't move it or anything. If I put my new branch in the pentagram too then it still fails.
Is there a way a can solve this quest?? Or am I now stuck ??
