User blog comment:B214/General discussion/@comment-73.57.25.92-20180407183508/@comment-31552453-20180407201436

We don't really know. I do think she is still alive, with Shizuku mentioning her in Vol 3, but apart from that, nothing has been revealed. I would suspect that she also wasn't that nice to Ikki, though perhaps not as harsh as Itsuki.