Agree with Sean on the try it yourself; I know people who roll from the hip, dragging the upper body along, and those who roll from the shoulders, those who find their place in the matress and basically just plant their arms and legs and turn in place, sprawl optional. Having said that, she looks like a 'spin in place' kinda girl, as she doesn't move from her position. Maybe start the roll from the shoulders, so she can see the star. That gives you the start to bring the knees up together (and if you do it right, you can use the knees to slide the covers back and down, leaving the hands free. Once the blanket is over the knees, a little back and forth of the knees will work the covering down the shins). That will get her on her back, arms free, and knees bent.