North American Cardinal with a bad beak, a Palm Warbler, and a mystery bird.

My North American Cardinal with the bad beak has earned the name, Sweetie. She is visiting more and more each day. We have two sets of Cardinals that chase her away if they see her, but she is persistent. Beavis, our Palm Warbler, dropped down, and grabbed a mealworm while I was filming this video. And a little mystery bird was sitting in the tree observing the action. I haven't had time yet to attempt identification of our mystery visitor. But, it looks like it is possibly a fledgling.