Nothing much is known before the apocalyspe.
Carley is seen chatting with Scarlett in Issue 13. She is later on greeted by Alfred, who then earns her heart by making her laugh. She is as well apart of the rebellion. She has slept with Alfred througout the issues at least twice.
In Issue 18, she takes part in the assualt. She is later shot in the head by John, because she threatend to kill Greta. She calls her a "bitch" because she is upset about Alfred not wanting a relationship anymore.