This discussion may contain spoilers!
So Jane's comment - about someone getting the others killed. I'm more than positive she's talking about Sarah.
And, if that's the case, I think she's right.
Sarah is clearly special needs; and due to her father's over protective nature, doesn't fully understand the dangers when it comes to walkers (case in point, how she flipped out when Carlos was shot, then quickly attacked. Her reaction, though understandable, put everyone at risk and potentially gave Sarita a death sentence after being bitten).
If Sarah is alive (highly probable), I think she'll be as Carlos said she'd be if she was exposed to the horrors of the walkers - ceasing to function,completely. And it's my fear that should a zombie Carlos appear within the ranks of the attacking walker horde, Sarah is going to confuse the dead Carlos for being her father and attempt to embrace him; thinking he survived and came back to her (this would also put everyone else at risk for a second time due to Sarah's actions, as none of them would be likely to just allow her to get killed).