I think whatever she gains at this age is "normal" for her. Each one is different and I would much rather see healthy gains like this than no gains. As long as she is healthy, she is fine with her gaining.
P.S. Don't worry about overfeeding if you are scared that is making her gain...there truly is no such thing as overfeeding a puppy. They need so much because they are growing and super energetic. (just make sure you feed healthy..not high fat..and she'll be fine)
