Kisa loved her mother dearly and ran away from home when she realized she was causing her so much pain. She was later found by Hatsuharu and cared for by Tohru, who understood her very well having been bullied herself. They became very close as the series progresses, and Kisa finally spoke thanks to the support she got from Tohru, Haru, and Yuki.
She's so adorable! Just like the Kisa I'm familiar with. And I really like the color of her eyes too! Wonderful job!