Shari thank you!
Mogambo, I think the muscles I'm after are deep erector spinae, quadratus lumborum, and iliocostalis lumborum. I looked up back in my "Women's Strength Training Anatomy" book and the three exercises I could do at home were torso extensions on the floor (what I call supermen), horizontal stabalizations (on hands and knees raising one arm forward and one leg straight back on opposite sides), and bent knee deadlifts. They had a couple of others that I could do at the gym but I really dislike going to the gym for weights (smelly crowded weightroom).
I guess by looking at that book there just aren't that many exercises for that area. I always though plank/pike was good for that area but that book didn't even mention them in the back or ab section.