Poor baby. Do you think she is really hungry or just obsessed (or bored?)
Does she have any other health problems?
As suggested, you might try changing her food to something with less fillers. There is a list on here with dog food ratings. Or even try switching to a raw diet.
If she is bored, next time she starts crying, distract her with a game or a walk. (sometimes I go to the pantry and cry when I am bored
)
Good luck, I know she needs to maintain a healthy weight, but we all hate to think our babies are hungry.