Sky is absolutely gorgeous.
It's a strange one, and no mistake, but I'm inclined to agree with Gill, that sometimes it's not always immediately obvious to someone who doesn't live with the cat to detect any changes and abnormalities. I'd keep a good eye on her, and if things don't improve, maybe ask for X-Rays to be taken.
Susanne's Mosi injured his tail a few weeks ago, and a vet inspection couldn't pinpoint the problem, but thankfully it's healed now, and he's back to his usual bouncy self. Moray had an intestinal infection earleir this year, which lasted three weeks. Again, our vet couldn't put his finger on what it was, but we knew he had a temperature, was off his food, throwing up and had the trots. Luckily, it cleared up after a course of meds, but we just can never predict.
It's good that you know how she should be, and how's she's been, and also that you have the video footage, which may help if you need to go back. Am hoping however that she won't need to, and will recover steadily.