Not sure why Chrichton is all torqued up about DID she or DIDN'T she kill her captor. Guy was imprisoning and torturing her and taking her back to have her mind wiped.. if she had to kill him to escape I can't see this as a character flaw. Wouldn't Crichton have done the same?
He doesn't know. As you've probably realized, at this point, Crichton is basically a guy trying to stay decent in increasingly difficult situations. He's holding on his ethics because it's the only thing that's holding him together.