First of all, are you eating enough? You need to eat enough of the right stuff. Lower the carbs and increase the protein and veggies. Also I heard that if you vary the calorie amounts in your daily range that should help. Like one day eat 1700 and the next 1200 so your body doesn't adjust to it.
Someone of this site is a nutritionist. Hopefully they will respond.
As for exercise, vary what you are doing again. Cardio will hlp burn fat. Are you sweating when you are doing it and getting in your target heart range? Make sure to keep up with the weight training. Muscle burns more than fat. Also try doing pilates. It not only strengthens the core and gives a long lean look but it increases your flexiblility.
Hope this helps somewhat.