ACtuly when you are closer to goal you should be on maintanance carbs. Cutting out refined sugars and flours can benifit anyone and greatly improve your health. Move your carbs up, maybe taking the advise of Atkins for life and going to 60, then either raising them or lowering them as needed.
For the midsection, females will almost always have a small round there. If you want to see ab muscles and tone the midsection so it's a small round instead of a "belly" you'll need to tone and lower body fat.
I really suggest you find out your body fat % first. You can do that through a local gym, or try an online site that uses your measurments. I like the one under resources at
www.zoneperfect.com
Weight lifting will help lower body fat, tone muscles, and increase strength. At your weight you may find it causes you to gain a little, but that will be lean weight. More lean mass means a higher metabolism, and better circulation (less cellulite). For targetting the midsection specifically, look into Pilates. It really workes the core muscles including abs and back, not to mention hips.
You might also look at the body for life forum and exercise plan. I enjoy it because it only takes 20-50 mins a day and you start to see results fairly fast. I'm only on my third week. Unfortunetly the scale hasn't moved, which is discouraging, but I have lost 2 inches and my cardio is way better. I can actually jog without panting now