I looked through the forums and I couldn't find the thread of our lovely Hogwarts librarian. If it exists and I overlooked (which is very likely) please feel free to delete this thread.
My question is very simple. Is she able to take points from students? She never does it in the books, but it seems plausible to me since she's in charge of the library and has to make sure people behave, return books, among other things. On the other hand, she did have her fair share of opportunities to take points from Harry and she never did.