At 5'4", I weight about 59kg. It feels just right for me, I am strong but not skinny, happy to have some curves (unfortunately no boobs worth mentioning). I got here from 64kg with primal eating and two weights classes per week and now staying here, full of health and energy and loving the primal food. I have even grown to enjoy the exercise.
I think shorter women have to be more careful with portion sizes, but upping the exercise gives you more leeway. Also, building some muscle not only creates a more toned and shapely figure but uses more calories and so allows you to eat more - a great bonus IMO.
Annie Ups the Ante