I can see how you would feel hurt and offended by your aunt's brusque dismissal. She could have smiled and said, let's talk after the service, and the prelude seems OK to me for a quick hello. I imagine she might have been nervous playing as she was filling in and didn't realize how rude she was being. And of course, there are some people who think that whatever they are doing is the most important thing in the world, and the heck with everyone else. But don't hold it against her too much, maybe a short phone call to her could smooth things out.
