Especially with the Saviors that walked out on the bridge project.
Carol does not like anyone who impedes upon her friends’ well-being, so she could easily be the mystery killer hiding behind kindness and an engagement ring.
She knows very well what the Saviors did to all the show’s main characters, and might not be done with her moral reckoning.
Whenever Walking Dead features several scenes where Melissa McBride’s Carol is smiling, is genuinely happy, and is overly concerned for the majority of those around her, something is totally off.