Susan, this may be a silly question, but when you move in a direction, are you also moving forward? the walkthrough isn't completely clear about that - you should be moving Left,forward, right, forward,right, forward, left, forward, right, forward, left forward,right, forward, so that each time you turn in a direction, you are also taking a step in that direction.
"How could drops of water know themselves to be a river? Yet the river flows on."
- Antoine de Saint-Exupéry