She may be nearing the end of a growth spurt and doesn't need as much food. Maybe you could just cut back a lttle on the amount of food at each feeding, until you reach your dog's "happy place".
I tried feeding once a day, and my dogs got really cranky! A vet on another forum said that once a day feedings CAN cause some behavior problems (not to say that it WILL happen to all dogs), such as food guarding around other pets, poo eating, and destructive behaviors. I know that my dogs are very happy eating twice daily. I just divide their daily ration in half for each feeding.
I tried feeding once a day, and my dogs got really cranky! A vet on another forum said that once a day feedings CAN cause some behavior problems (not to say that it WILL happen to all dogs), such as food guarding around other pets, poo eating, and destructive behaviors. I know that my dogs are very happy eating twice daily. I just divide their daily ration in half for each feeding.