Get a kong ball, maybe the medium one, and roll it for her. She'll chase, then teach her to bring it back ( I do this with having a 2nd ball in my hand t 'tease' her back.
When she drops one, roll the second.
She'll soon be engaged in the game and directed to teeth on ball.
Start traing simple sit (with) treat.
She sounds like a normal GSD pup to me.
Remember, she wants attention, has no 'hands,' and needs mental exercise as much as physical.
Hang in there - this will pass!
Nothing is as simple as it seems or as complicated as we make it~
Attitude is everything -- Pick a good one!
Sofie AKA Ussina vom Haus Brezel
Jack von Jagenstadt
Tatty - Burmese bad cat