Owl update. Lady Owl poked out of the box early enough last night that several of the other resident birds were still out and about, took notice and went bonkers. A Junco, Bewick's Wren and Anna's Hummingbird all flew around yelling at Lady Owl in their own way, I'm sure they all have nests in the area right now (although I've yet to see any of them.) Here's a video of some of that happening: https://drive.google.com/file/d/1VcQJwWtXPjr5DdGl2kw5hLVz46yWT8t5/view?usp=sharing.
Disclaimer that the video is fairly messy, and I uploaded a lower-quality version than the original. Also unfortunately my music was playing loudly at the beginning, otherwise there's a lot of Junco and Wren yelling going on. Over the course of the video you'll see a Junco, Wren and Hummingbird all go up to Lady Owl, very ballsy, and you'll see her utter indifference.
Still no sign of offspring.
Here's a Flickr album with a larger collection of photos and videos of the Owl family: https://flic.kr/s/aHsmVZPnT5