M.S.
Every baby eats a different amount, and they change how much they eat depending on whether or not they are going through a growth spurt. The average amount for a 24 hour period is 32 oz, but there where weeks when my son ate 64 ounces and the pediatrician assured me that is normal for him. As long as you are not feeding your baby all day long when you simply want her to be quiet or leave you alone, or forcing her to finish bottles she doesn't want, then you cannot overfeed her. You should never restrict your baby's food unless the Dr tells you to. Instead, you can make sure it is food she is asking for and not attention or a nap. Your baby being Roley-polly (like mine) is genetically programed in her, not the result of too many calories. Instead, it is the other way around. Because she is so big, she requires more calorie and thus eats more. A baby is born being able to regulate how much food they need.
Just one more note, in case someone is another post advises you to give her water... Water can be toxic to young babies and should never be given to a baby under 6 months. It can damage the kidneys, cause malnutrition, and mess up the balance of electrolytes in her body.