Sometimes they become more aloof as they mature.
The bigger issue is that you don't have a solid recall on your dog, so I would keep her on a training line at all times when you are out of doors, for now.
Not just because of the jumping up, but if she got into the road, or ran up to a dog who was dog-aggressive, you could end up with some big trouble.
I'd rather have a GSD that is unusually friendly than the reverse. She sounds like a confident, light hearted dog.