That first pic of her chewing on your feet had me laughing out loud! Typical puppy!
Hard to tell - I think there is something else in there - the very short coat (gsd puppies are usually fluffier), the specific eyebrow points - they don't usually show up on puppies this young), and the roundness of the head makes me think that there is something else in there.
But the chewing your feet is 100% GSD puppy Land-Shark behaviour, so we know that she is partly GSD, haha!
All the pics made me smile though, she looks like happy, happy pup!