Yep, you got it. We noticed but just ignore it. No need to get lost in the novel's logic. Just enjoy the story.
She is both. But she remembers the life of the 1st Kayenna so vividly that they are basically one of the same now.
She is actually the real Cayena. She died in her 1st life as Cayena and reincarnated in a different world. Then she read the book that tells her 1st life and how it ended. She died again after being killed and went back to her 1st life as Cayena.
A complicated way to get revenge ╮(￣▽￣)╭
anyone noticed her monologue? "Before I cam back to the past..." & "In the novel..."
So Cayena and the transmigrator's conciousness merged or something?