I'm guessing that there won't be too much, if any, development of Kyrie. She's a write-off, I think, so there's no point dwelling on a character that won't play an active role in the game. They might do a DMC4 scene (the one where everything goes black and you hear Kyrie scream and Nero's heartbeat) but with flashes of what happens (ala the trailer where Nero's arm gets ripped off).
They might not do a clear cut, this is what Kyrie looks like and this is what happens to her.
Because Capcom likes to leave us hangin', and all that.