You have to take the raptor back to her, and after that you can learn it in the book at your house, and if I'm not mistaken the "find Roushk" only checks out after defeating him
The witch is different if you go there at day or at night. She is either an old or a young woman. Only one of them gives you the quest to bring her the raptor (I think you have to go there at day to get the task, but I'm not sure on that)
