She probably was real, I was half-kidding.
But there was a weirdness to her being so close to the prison (it seemed) and Rick just deciding to go with her alone into a potential trap (it was).
Having been to the same airport, liking the same statue. (IIRC)
I could believe a walker (her) got the boar, then it moved toward him and he shot it and then spaced out, imagining her story, how she got to this point. He's killed walkers so much he forgot they were human.
I don't think we need more crazy Rick, though. I think there'll be enough things going on.