Did she give you the paperwork?
If she did, the puppy looks GSD, I see no reason to doubt it. It is all water under the bridge now. You brought the puppy home, and it is yours, papers or not, pedigree or not, purebred or not.
It's a cute puppy, and at this point it looks all GSD to me.
Jenna, RN CGC & Babs, CD RA CGC HIC
Heidi, RA CGC
SG3 Odessa, SchH1, Kkl1, AD
Ninja, RN CGC & Milla, RN CGC
Joy, Star Puppy, RN CGC
Dolly CGC & Bear CGC