I can't believe no one here is looking at _what_ she is eating. A bowl of cereal is high GI. Of course she is going to still feel hungry after. It goes right through you..

Rather than focus on hocus pocus advice like eat with chopsticks or whatever else is suggested, why not actually look at what you're eating with them. One person above me nailed it. Stop with the simple carbs (most breakfast foods) and start with the slow digesting complex and filling foods. Seriously try and stay hungry eating 1500 calroies of lean meats, fish and veggies a day. You'll eat till you're ready to explode trying to get enough calories in to hit goal. It might take a lil willpower to toss out everything bad for you and just have the staples on hand, but feeling hungry should be the least of your problems with a few healthy changes in your diet.

edit:
so i'm not guilty of doing the same and not giving real advice, change cereal with vegetables. Seriously load up on it. If you're familiar with the GI index, exchange a lot of the higher based foods out for lower ones. And increase protein consumption and probably fat consumption as well.. I find a lot of "healthy" diets people think they are eating are very short on those macros. A typical healthy cutting diet should be 40-50% carbs, 20-30% protein and 20-30% fats. But ya, in terms of calories, 10 cups of brocolli for example is 300 calories only. Seriously try and be hungry after eating that much. You'll be stuffed. Also drink a glass of water with every mean. Hell, drink two. A lot of times thirst is mistaken for hunger. So that possibly could also help.