It looks to me like she is sleeping with her chin down on the floor. Is that right? Is she is acting normal otherwise? Eating, peeing, pooping, purring? If so, I probably wouldn't worry about it if she were my cat. But if she isn't acting normal, that's a whole different thing.
BTW, one of mine sleeps like that sometimes, too. He also sleeps flat on his back with his feet in the air. And sometimes all twisted in different directions.