Once she could stand, we helped her slide around a bit so she could learn to keep her legs together. Then Dave started carrying her up to the "top" and let her go, while I ran backwards a few free in front to keep her upright and catch her if she caught an edge. By the end she had really made progress and could "ski" about 50 feet on her own, making balance corrections and sliding until her speed ran out without falling. Not bad for a first try!
Video of Sophie Skiing - this is her first four "runs". After I put the camera away she did three or four more and improved each time!