She might have been born this way, without an empathy gene and other essentials. In that case, she would interpret any kindness as weakness. Among predatory beasts, any display of weakness is an invitation to attack.
Dean KoontzOn those occasions when he had killed in the dark, he later needed to see his victims' faces because, in some unlit corner of his heart, he half expected to find his own face looking up at him, ice-white and dead-eyed. "Deep down," the dream-victim had said, "You know that you're already dead yourself, burnt out inside. You realize that you have far more in common with your victims after you've killed them than before.
Dean KoontzGolden retrievers are not bred to be guard dogs, and considering the size of their hearts and their irrepressible joy in life, they are less likely to bite than to bark, less likely to bark than to lick a hand in greeting. In spite of their size, they think they are lap dogs, and in spite of being dogs, they think they are also human, and nearly every human they meet is judged to have the potential to be a boon companion who might, at many moment, cry, "Let's go!" and lead them on a great adventure.
Dean Koontz