Sabrina is a japanese brand that probably makes the best powder board for women, the Cruzer. I don't think it would be easy or cheap to get hold of one, but they have some reps in Whistler. The tail width is 250, and that will help alot with making good turns. Boards like that are more for advanced freeriding and powder though. Pair it up with a Burton Escapade and the right boots, you would have an awesome setup. Just to give you an idea of what's out there. Besides that, the Never Summers and the Jess Kimura series from Capita are the most narrow twins I've seen, or seen recommended on the forums.