Maybe Andrea will be with woodbury on the attack of the prison and during the assualt she will shoot Lori. she couldn't tell if it was her because she was running away and only saw her backside and shoots her. RIght after that instead of Lori crushing the baby she would just drop her baby to the side or something, then the governor forces lily to kill the baby. then Andrea kills the governor for forcing Lily to murder the baby then all the woodbury soldiers head into the prison with the exception of Andrea and Michonne who then find Rick and Carl later.
So what do you guys think? sorry if they are any grammar or spelling errors