That is very odd. I've never seen a mother with a kitten this small visit a scrape. The reason is that male mountain lions can be dangerous to her kitten. And then leaving her scent seemed even more inexplicable.
Indeed, a male mountain lion arrived at the same spot two days later. He was exceptionally interested in the female's scent. He spent about 3 minutes sniffing the area and repeatedly marking. Then, he headed off in the same direction as she went.
I am mystified. Could the female be in estrus because she has only one kitten? Usually, they have three or four, although mortality means that they have two by the time the kittens get bigger.
Time will tell. In the meantime, check out the video!