Yes. It is normal GSD puppy behavior. Please stop putting the puppy on her side. She is not being aggressive. She is playing. 9 weeks is much too young to even consider aggression. Just redirect her, if she starts getting to rough. Give you senior dog a break from her, if need be. Put the pup in a crate or gate her in another room.
Natty Boh 6-27-12
Annie 1998 - 8-2-12 RIP