You don't say WHEN you eat these calories, B.. Here's the rule of thumb - eat within the first hour you are awake. Never skip breakfast. Have a high protein food for breakfast - at least 25 grams of protein. Drink a full 10 ounces of water as soon as you get up. Then drink half of your water, a bit at a time, before 1:00 in the afternoon. The rest of it, drink throughout the rest of the day.
Have a protein snack (lowfat string cheese, Greek yogurt with at least 19 grams of protein) for your mid-morning and mid-afternoon snacks. If you get hungry, your metabolism gets slower. Munch on vegetables along with those protein snacks.
Don't eat more than 2 or 3 fruits a day, and don't have more than 2 servings of bread/or starches a day. Any bread should be whole grain. If you can stand it, don't eat white rice or regular pasta either - the healthy grain stuff (like brown rice) is much better.
Don't eat more than a card sized portion of meat. And don't eat after 7:00. I'd up your calories to 1400, if I were you.
Try these changes and see if that doesn't break your plateau.
Good luck!
Dawn