It's difficult to tell, for German Shepherds tend to be very rough players.
I don't think you should be letting the puppy bother the one year old like this. She may decide to seruously injure your pup if she has had enough. I do think your puppy is probably just being playful. My 19 month old terrorizes my five year old. He just wants to play, but the five year old doesn't like to play rough like the 19 month old.
Varick vom Haus Jeffery
Dark Sable, intact male
DDR/West German Show Lines