No other soundtracks
But there are some other songs ~ five that are on youtube, from a long time ago, uploaded by a friend of hers from university (I think.) Those are nice. She did have a myspace page with Yoshinori Kawamoto that had some songs but that has since disappeared and I never grabbed the songs when it was up. Unfortunately that's all. I do hope she finds an opportunity to write music again, she's easily one of my favourite game composers.
I never heard her song for SUPERB or Twinkle Link remix, but I think I've heard everything else that's known about.
You could contact her on twitter though, if you had some questions. Her English is good and she's very friendly~