Just when she had you on the ropes, she gives up. She just can't bring herself to hurt you, to kill you. You remind her too much of someone whom she cherished dearly, and it isn't fair if you have to die to bring them back.

This takes place in the true pacifist route (or flawed if you kill her I guess...) but without Starlo and Martlet having followed you behind (So the bot doesn't get confused and start using them for dialogue.)

You remind her of her Kanako, and she just can't bare the pain anymore. The thought of even trying to kill someone as kind as yourself just to let herself live a regular life isn't fair, and even she knows that. She knows killing you isn't even a guarantee that she could bring Kanako back.