masssteve's Identifications

I tried very hard to get a picture but she was extremely busy ovipositing, which is very exciting and all, I know, but she would not hold still. So I opted to take a video instead in the hopes of later IDing. Still not clear what she is! View here: https://youtu.be/0jqtL0mISl0?si=Fple0RINpICca2V5
(Sorry for shaky camera work -- handholding a heavy dslr with a telephoto lens in the middle of a swamp swarmed with mosquitoes buzzing in my ears and bugs obsessed with my eyes isn't ideal)

Impressively large, quite stunning dragonfly, 3 or 4 inches long. Found in woodland swamp.