I'm going back and forth on Carol.. During the episode I thought she was faking the scared and I do think she was faking that part.. The "Old Carol" showed up when that girl took a swipe at Maggie's belly with the knife..
But the part of telling Paula to run had me thinking "WTF??"
But upon reflection, last week they did have her having a moment alone of not being able to sleep and updating her journal with the number 18 and seeming upset about it..
Plus the interactions with Morgan does have her questioning the "Must kill everyone"..
Then they go and burn down the Killing room with Carol nonchalantly throwing in the cig and walking away.. So not sure which Carol is going to stick around..