Or, 7/8 people were "weak no", they heard her argument, then changed their minds to "weak yes."

The whole point of a committee is to reach consensus. I've flipped my beliefs on many candidates before after hearing what other interviewers think. I think most of us understand that interviews aren't exactly the best way to judge a candidate - at least I think that way. So I'm pretty open to forming consensus when I'm "weak" and they are "strong" in opinion (especially if I respect their judgement).