I'm guessing Glenn's GF (is that Maggie? Been a while). When Glenn freaked right out when they got close to her, it kinda made her a target as they know it would really hurt him if they got her. I'm kind of torn between her, or Carl. I could see them get Carl just for the extra shock value of killing a kid especially the brutal way they did it. On the other hand I could see Carl become the "main" character so to speak, Rick is probably going to die this season and the torch will go to Carl. Just a wild guess mind you.
I have a love/hate relationship with this show now. There is enough suspense that I always want to keep watching, but I'm also tired of the repetitiousness. Something big and different needs to happen to make it interesting again. Idealy it needs to just come to a wrap. They're pretty much just milking it at this point though.