Okay thanks )Do not take your puppy for an hour run every morning at 12 weeks old. This hurts development and stresses not yet strong bones... Short daily walks at this age - no long runs for many months - their structure grows very slowly (2 years). GSD's have a history with bone and joint problems.
Yeah we just walk but on the way back she likes to run and if I dont run with her she would usually just pull the leash hardI don't have a comment on how big your girl will get, but I will comment on you running a three month old puppy for an hour every morning. That is really not good for her growing joints. If you meant that you let her run around at her own pace on a soft surface (grass), please ignore my comment. But, if you are running her at your pace on a hard surface at this age, I strongly recommend you stop.
She's a real cutie. Best of luck with her!