keep going to kali's room and choose "talk" any time it shows up. there are several quests for her and her sister, complete them. also try visiting her at school.
they dont show up in the hotsprings until you see enough scenes this way.
Did you fuck her at her dad's house? if so it actually ends her story, if you dont want to cheat then reload a save, otherwise use the "truestory" cheatcod
