Does she have diarrhea and is always hungry. Maybe not gaining weight for the food she eats? If it's just a fast eating thing then feed her a little and wait a few minutes then feed her the other half. But you may want to make sure she doesn't have hook worms. The traditional dewormer doesn't kill hook worms and they are ravenous.
Place a rock or rocks in her food bowl (obviously large enough that she won't accidentally eat it/them or even try to). She will then have to work to get to the food around and between these obstacles, which will make it take her longer to eat the same amount of food.
Get her a food dispensing toy! My dog scarfs her food and pukes it all back up. With the toy she has to work for her food and its it little pieces at a time. Also it gives them mental exercise because they have to use their brain to figure out how to get the food out!