I would definitely not act aggressive towards her, that's like poking a bear. You don't want her to see you as something she needs to be wary or concerned about.
With genetics, they come into play in building the foundation of the dog. They will help build temperament, drive, demeanor, etc. It's up to you as the owner/handler to mold that foundation into what you want. If you don't want a schutzhund dog, then you may need to find something else to work her in if she has a lot of energy and drive.
Was she temperament tested as a pup? Can you post her pedigree? Is she well socialized, calm in new situations, etc? I would not recommend trying to trigger any sort of protective response unless you're in a situation where you are intentionally training for it.
MacKenzie - Workling Line Female (In Loving Memory)
Wolfram - West German Showline Male [SG1, CGC, DDN, CN, EN, IN, VN]
Bash - Working Line Puppy