I think she is jealous, of course Photography is an art. While we don't muck around with pencils, paint, clay, crayons etc. We make images, pleasing images with light, mechanics, chemicals and thin strips of plastic film. These images can be for strictly beauty's sake, tell a story, start a controversy, used for purly commercial purposes. Regardless of the goal it is the creative side of your brain that gets the workout.
As for what other "artists" think of this medium, that is their problem, not mine.