Emm well I mean she doesnt really have any claim on the movie. I know she of course was the brains behind the idea, but when it came to making the movie, she wasnt really involved. I know she visited the set and stuff, but she didnt technically do anything, so I dont imagine she would have been invited.
Has J K Rowling ever been before? (Im not sure but I dont think she has been). I guess its the same kind of thing.
I suppose its just like she sticks to stuff 더 많이 to do with the books.