Later, her efforts to spare Mark’s face for his diddlings with Amber were rejected by Negan, giving her further anguish when Mark’s skin sizzled.
Someone that Dwight is pretty close to, who would have access to him having access to that cell’s key.
It might just be someone who shares Dwight’s initial distaste for Negan’s ways, with the same amount of reasons for wanting to go against the perverse leader’s will.
And she shared a smoke with Dwight, which is prime key-switching time.