Please don't use the term vicious to describe an 8 week old puppy. She's not vicious. She's a puppy and a GSD puppy at that. They're mouthy. Some more so than others but still not anything to be called vicious. Determined or stubborn, maybe. Vicious, not so much.
Bring in a trainer to help you. You'll get there.
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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