I can think of three guys just from the Narrows who could kill him.

[And if street trash like her knows who to go to, then someone who could get the Waynes killed can probably manage a lot more.]

It doesn't matter - he'd start killing strangers, say it's your fault, and that would still get you.

[It's like she told his clone: Bruce wouldn't just try to save one person. He'd save everyone. She knows him.]