Aud looked at Jimmy, trying to save the alien.  It was admirable, but the alien -- the Andalite, had already impressed the danger of that course upon them.  What's more, he was a soldier in this war, he had already weighed his strategy against other possible actions.  It was a harsh reality, but Audrey accepted it as readily as she had accepted the call to fight the invaders.  

"You'll need to be dead before they arrive," she said to the Andalite, "Won't you?  Thank you," she put her hand on his shoulder before stepping away, "For helping us fight for our planet.  Godspeed."  

She turned, and gestured for the others to follow as she made her back out of the spaceship.  They needed to leave fast.