Sir, she was WEARING HER SKIN. If skinned, you live for a max of DAYS, and that's if you're cared for. I doubt cyn cared whether Tessa lived, and the Elliot manor massacre likely happened years ago. Tessa had been dead for a while.
If skinned, Tessa would have survived a few DAYS at most, and that implies that cyn cared whether or not she lived. The massacre likely took place years ago.