Kate is sitting on egg(s)!
I believe she laid them yesterday, Christmas Day.
In the slide show you see her make a 90 second flight of 2 round trips.
She cannot leave the eggs without her body heat for more than about 2 minutes in this kind of weather.
I don’t know if she was looking for Petruchio to see if he was bringing food or she just needed some wing time.
That little white sliver in 2 of the 3 last photos
is what we will most often get to see of Kate while she is incubating.
Stay tuned: hatching in about 35 days.