Kitty is Improving
Some tentative good news - my kitty, Aria, is lightly using her paw again when she walks. Not every time, but definitely last night and this morning a little bit. Which implies that it was a bad sprain (the vet's original diagnosis when I took her in a week before the appointment where he took x-rays). I've seen no sign of an embolism - both eyes blink fine, breath out of both nostrils, both sides are fully sensitive and getting stroked on either side elicits loud purring, just a sore paw that seems to be getting better. She sleeps, she eats, she's playful, she's demanding, she sweet, she's fully herself. It's been 2½ weeks since I first noticed a limp. She still scoots around on three legs, but there is slight improvement (it's that right front leg in the photo) and, hopefully, she is healing.
I am quite happy indeed. The vet may have been right in his diagnosis on our first appointment.