When birds attack!...(OT)

There's a female Cardinal attacking our kitchen window. She's done this for a few days, but this is the first time I've been home in the morning while she hit the pane again and again. When I walk outside or into the kitchen she flies away only to return in a few minutes to resume the attack. I have to assume she sees her reflection in the glass. This bird has no learning curve. It's a flat line.

I could just shoot her, of course. But besides the fact that it's illegal to shoot songbirds, I'd rather change her behavior. But how do I accomplish that?

The cats are fascinated. They sit on the kitchen floor below the window, looking up in anticipation.