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Since you have an android PC one thing I suggest (which I wish I had done) is have the body that the android PC is using actually be the remains of Cassandalee (or if it is a male android change Cassandalee into a male android). It would still allow Cassandalee to be the AI (since in the neurocam she downloaded her earlier consciousness) and the PC (since when androids "die" the can reboot and a new consciousness/soul takes over). I could imagine the confrontation with Hellion would be interesting, he could call the android PC sister/brother and say that "Unity has been searching for you". You would just have to remember that where they normally find the destroyed remains of Cassandalee in book 3 that it wouldn't be there, so perhaps they could watch a video in the security office of Cassandalee dying in the room and then some time later rising back up. This would mean there were some further incarnations between Cassandalee's death and your PC's birth.