Sara
I don't make complaints, give negative reviews until the story is done, I just don't complain or judge until it's over.
From my own Personal Experience, every time we dislike, judge, complain about something, then it ends up even better.
and here I am, I don't like that Sara Died, I think She deserved more, at Least another teen to live as a peer to Clem.
Carlos said, She will cease to Function.
Also, even if she lived, she will be depressed and unstable for weeks. chances of her to get better are slim, and chances of her Panicking and running off during hordes or some walkers are high. She listens to Clem, but when walkers come, it puts back in her terrified Mind, and Clem will just have to keep slapping her.
Sara is more complex character in personality. I know she wouldn't have made it long, but it was too soon.