One of the hardest aspects of my job as fitness coach is to tell you that you may have to eat more! Try telling a woman that has dieted most of her life that she isn't eating enough and that could be the reason she just can't get those pounds off.
Eating smaller meals but more often also boosts your metabolism which in turn burns more fat and the cycle keeps going. Keeping an eye on what you eat is just as important as when you eat it. Skipping meals may tempt you into eating more when you finally do eat. Eating a healthy breakfast and another 4-5 meals throughout the day keeps an even keel on your blood sugar.
You also have to eat enough calories to fuel that body of yours, eating too few throws your body into starvation mode; a natural process because your body isn't getting enough and it doesn't know when you will feed it again. This occurs quite a bit when you diet due to calorie restriction.
Give it a try if you feel you've hit a plateau or to avoid the possibility of overeating.

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