Tonight, I played a hunch that the female had moved to a Black Locust tree that had been used a few years ago by the owl pair in 2007 after they moved out of the Willow.
I must have learned how to think like an owl, because she appeared right at dusk. I was happy for her, since I suspect she got some rest. The cavities she been using around Glen Span Arch, require her to be alert during the day.
After her fly out, she went to a nearby tree, then to a tree on the shore of The Pool. Quickly she went across the Pool, to the north shore langing on a Sweet Gum tree, and then to a tree across the foot path where she preened. Then she went to the down near the ground and I lost her. She may have been hunting or making her way up the Great Hill.
She made no calls while I was there. I lost her after about an hour.
I certainly hope that the owl tour scheduled by the parks department or any Birding Bob tours, don't use owl vocalizations over the next few weeks. The female is finally starting to settle down and get used to being a widow again.