Okay time to stop keeping you in suspense!
All the people who guessed LEFT....were WRONG!
So congrats to Arreau who had it first and everyone else who thought it was the right.
The horse riders on here would understand her trot to be almost like a haunches out. If you look at the picture, her L hind is actually in line with her R fore. It doesn't always do it but she does it often enough because she's favouring the right. So MollyMuiMa had the right idea, she does reach under more with the left.
Here's the pic. She is NOT turning but actually going straight. I'm totally behind her but you can see she's swung her hip over a titch. Now watch the video again and facepalm yourselves
lol jk it does take a good eye but that's why we share these things with each other, so we can learn!