Redpoll dance

This little gal has been seen constantly perching on the side of our truck, covering the door and mirror with unmentionable stuff. I've caught her at it countless times over the course of the last week. I finally was able to get into the truck and wait for her to see what she's doing. She comes in and lands, then perches and stretches up and down, looking at her reflection. It's very cute and perplexing. I wonder what she's thinking of.