Sally gave the woman a questioning look, she spoke as if she was a science experiment, no normal human spoke like that. "But my glowing, white force field makes it hard for me to just walk out into public without being chased out and attacked." She retorted, this woman wasn't normal, she had to be a mutant, the way she spoke of killing being her mission, the way she spoke in general, her stance, everything now told Sally she was a mutant too.
"I just assumed, by your appearance that you were human and lately humans have been attacking mutants, especially the ones that stick out, which is what I do." Sally explained, even though the stranger was a mutant, didn't mean Sally would just instantly trust her now, even mutants had shunned her and tried to turn her hideous. this just meant the woman had no plans of fighting, which was a start.
"I'm not mentally deficient, just cautious. Perhaps overly so but for good reason. And I have no attempts to 'lure you in'" She expressed with air quotes to the lady that was now insulting her mental abilities.