Speak to Sion: Eh, what's going on?
By the way, her sister is called Sakura, if it makes a difference. She has purple hair and eyes, and wears a red ribbon that was a gift from Rin when they were young in her hair. She was separated from Rin as a child and given to another family, but Rin always tried to watch over her. The other family didn't treat her well, though, so it's possible she's remembering something because of that.