Hi, my male Dozer poops about 4 or 5 times a day, and my female usually only 2 or 3 times a day, they eat the same food and the same amount. I think every dog is different and have different metabolisms. What type of food do you feed her? At 15 months 1/2 cup 3 times a day seems too little for a growing puppy, my 2 ate 1 cup 3 times a day until they were 7 months old, and then I switched them to 1 1/2 cups twice a day. A puppy needs the extra calories, and vitamins for rapid growth, and because they are so active. If the poop is normal and soft but firm , not runny or soft, I wouldn't worry about it, just might be normal for her.