I suspect this wasn't a staged/planned session, as there's a couple of points which probably hurt and could have/may have caused injuries.
I guess the loop collapsed under the tension, leaving her ankle stuck at head height.
First off, solo inverted suspension is rather risky.
If something breaks, so can your neck.
Your screwed if you black out from being upside down.
I'm assuming the loop wasn't meant to tighten, so that probably accounts for the lack of a quick release method or backup.
Even so, thats a stupid error when working with rope, as there's several knots which will capsize or invert when loaded in the wrong direction or tied slightly wrong.
Obviously not safe for work link.
https://m.nuvid.com/video/5523983/naked ... gone-wrong