Your dog looks absolutely, perfectly normal for a GSD. The ears are the right size--this is just that "awkward teenager" stage where they look a little gangly. She will grow into them, and will (continue to) be a gorgeous GSD!
I find that most of the people who comment on the ears are simply not used to seeing GSD pups, and are a little rude. I don't walk up to pug owners and ask "Where is his nose??"
Liesl, b. 1/1/11