The Long Con(nection)
The reason Marina Casandra Dorian stopped being a villain and became an antihero
Backstory
Little is known about what happened to cause Marina Casandra Dorian to undergo a change in her morality, but what is known from context clues after the fact is that she gained an appreciation for agriculture and potentially had to kill someone named Emily Estimada with Emily, named after her.
Sometimes people seem to change for no reason, and as such you have no reason to believe it's true. Nevertheless, it's important to have trust in people and believe they can, and have, changed for the better.