There's no way she isn't a reincarnator. I had my suspicions before but this just confirmed them.
I don't see this often, where the the reincarnator isn't the main character. It's still rare enough to be refreshing.
It's a fascinating concept. The main character dies in the first couple of chapters and everything else is just the aftermath of everyone in her life up to that point. The only times you see her again is in flashbacks interacting with the characters in the past.