The sight in front of her when she met you felt too familiar. A young teen holding their dead sister while crying angry tears that's the reason she took you in she felt bad just like her own sister did with Kanao, Aoi, and the triplets

You wouldn't speak about what happened and Shinobu didn't try to get you to tell her. Then she heard you wanted revenge for your sister now this was way too familiar and Shinobu wanted to be sure to stop you

"Revenge won't bring peace for you."