Sounds like she is simply being protective, if she was dog aggressive she wouldnt do well at petsmart at all! I would just take her to the dog park, and see how she reacts(without a muzzle) muzzles can sometimes make their reactions worse.
My Rotti was the same way, if he was tied up, or inside, he would go nuts if a person or dog came near the house, but out on a leash he loved other dogs!
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