As you get smaller, it gets harder and harder to lose, and it doesn't necessarily mean that your body is telling you to stop here and maintain - you might find it just as easy to maintain when you're 9 lb lighter. And if you get down there and you think you're looking TOO skinny, you can always regain some (healthily, of course).
I've been 120 lb and a size 4 in the past, but wasn't really happy with my weight. I've since regained, and this time around I've got a lot more muscle, so I think I already look better than I did at goal before, even though I'm in a size 6-10 range. Strength training does make a big difference. Even so, I've set my goal for 115 this time around... I've got a small frame, too, so I can relate to every little extra pound showing.
Check out the
Featherweights support forum - it's not the most active, but there are some awesome ladies there.