"hm, that is true." Mami thought about this. "Perhaps her death was caused internally, and simply lucky enough that it wasn't lost in the witch ward... "
"Maybe we should look into this" Miku suggested "Like if we look into her coroner reports, or where her final moments."
"Yes, perhaps... there was something a bit odd though. when we found her, her soul gem ring was broken, the the mark upon her fingernail was smudged...