Colonel Nicholson: Yes, Clipton. I understand, truly. But don't you see it's a matter of principle? If we give in now, there will be no end to it. No!

Major Clipton: Sir, we're lost in the jungle, a thousand miles from anywhere. We're under the heel of a man who will stop at nothing to get his way. Principle? No one will know or care what happens to us! Give in, sir! Please!

I guess she thought she'd win like Nicholson.