I figured it out on how to switch it back n fourth...
The trick is when the outstretched leg crosses the one she's spinning on. Its how you "think" about it, when it crosses. If it's spinning counterclock, when the leg is going to go behind her, you have to think that the leg is actually going in front of her. And at the point, the immage will "flicker" and sometimes it switches to spinning the other way, other times it flickers and keeps going, but the time when the outstretched limb is eigther in front or behind is key to making it spin one way or the other.
Not sure if that makes sense... It's kinda like if the leg was going counter clock, and then was suddenly in front (when it crosses her other leg), but the leg was still going to the right, it would suddenly have to be spinning clockwise. And if you can "trick" you brain into seeing that, she will start spinning the other way. Works both ways.