She's similar to my girl. Her coat is just a bit longer. My girl is a patterned sable. Her dad was German SL and her mom was a SL/working line. Beyond that, that's all I can tell you. Perhaps similar lines in your pup.
This is my girl
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Shasta GSD 5/5/10 CGC, ITD, TC
"Dax" Thor z vom Weberhaus CAX, CGCA, ETD, HCT, NCO-1, PKD-T, RATI, RATN, RA, TC 3/18/2013
Zena GSD 6/1/03-2/16/2016
Riley GSD/BC 1/10/05-2/1/2013