 How is Mary feeling at the beginning of the story?
Yes, I'm sure you did," she said, finishing the ritual; but her voice broke, and she turned her head away. "Mary, you know I can't back out now. But I don't think I ever really believed it was possible—not until this morning when you said tonight was the take-off. It existed only because of the huge ship standing poised in the take-off zone five miles away in the desert. Its future as a town rested with the ship, and the town seemed to feel the uncertainty of its future, seemed ready to stop existing as a town and to give itself back to the desert, if such was its destiny.
 She is desperate for Phil not to leave.
 She is desperate for Phil not to leave.  She is angry at Phil for not taking her seriously.  She is frustrated with Phil for not letting Sammy replace him.  She is depressed because she thinks she is going to lose Phil forever.