Are you training with a treat? If you are it is kind of simple. When you give her the SIT command, with your left hand, show her the treat and put it out beyond the left side of her head, and then back up over her head to get her to sit. By angling her head away from you -- watching the treat, the butt comes in next to your leg.
It's worth a try. Good luck.
Bear Cub, Hepsi-Pepsi
Cujo2, Karma Chameleon
Ramona the Pest, Kojak -- who loves you baby?
Tiny Tinnie, Susie's Uzzi, Kaiah -- The Baby Monster.