That sounds like a very typical stance in dragons, but of course if its something you've never really noticed before, it might be a good idea to get her checked over by a reptile vet. In other animals this behaviour can indicate a middle ear infection, or injury to their neck or spine, or pinched nerve. Watch her balance, too. If she appears to be leaning to one side, or a little off balance, definitely get her checked out.
Are you sure there isn't a bug on the roof of the cage, or something catching her attention or just soaking up the warmth knowing the air temps are getting cooler. I have a bungy jumping ackie - I finally realised there was a tiny cockroach on the roof and he was trying to get it. :lol: