A 4 month GSD female ranges from 28 to 35 with average being around 33, she is just 3 pounds off the slim end of appropriate weight, which is probably fine. Was your vet happy with her weight?
At this age she should be gaining about 1.5 to 2 pounds maximum a week until about 5 months. She is still to reach her height, about 8 months, so I would just monitor her and if at any stage you feel you are feeding her adequate amounts of food, or even more than recommended and she is not putting on weight and/or her poops are not healthy looking, then talk to your vet.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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