Something that I noticed early on was that the "secular" magic words, "Abra-Cadabra" were so closely related to the killing curse... I thought that was very interesting, possibly indicating that she doesn't approve of magic (the occult, and how dangerous it can be?) herself.
Mark
Good observation. Someone also pointed out earlier that her mocking portrayal of Trelawny could also indicated her disapproval of "real life" witches.