There's too many variables here. Hereditary, environmental, dietary, activity and so much more. Try not to stress yourself out. Monitoring weight, good quality food and vet checks routine and as needed. I'm saying this from experience. In reading way back there's basically 3 types of grey. The larger Cameroon (spelling), Congo middle size and Gold or Ivory coast being the smallest. Your girl could be the later. My avain vet suggested that to me when my CAG was 6 months old. I was in a worried funk because she was a healthy and small 350 gm. Remember that there's the human element. People who didn't know breeding these types together. They look remarkably alike. In the wild the 3 types were environmentally separated. So the genetic stock in captive breed CAG is very different from their wild bred relatives. Enjoy your active one. Be alert to weight, activity, diet etc. Your baby sounds like she's gonna be a handful.