If she is on her back: move both of her arms twice until they are above her head, then click near her belly to turn her over.
If she's on her belly: just click on her lower back to turn her over.
Oh theres an update. Also please can you add more positions? Like 1 raised leg?
If you have positions (or anything else) you would like to suggest, there is a form in the Discord. Try to be descriptive and refer to the positions by name, if possible.