"Because - because if they killed us the 'Bots would've just kicked their tailpipes! They wanted to make them trade, not just tick them off!"

She looks sort of affronted on Optimus's behalf at that second part. So maybe there were a few million years of war that she wasn't there for, but that doesn't sound like the Optimus she knows. "But why would he do that?! He knows the Autobots need him, he wouldn't just leave them like that!"