how did hughes walter change missy's life in the bean trees

Mr. Walter changes Marietta's life when he tells his students about a possible job opening at the hospital where his wife works. Marietta thinks that he will offer the job to a Candy Striper, but Mama insists that Marietta demand the opportunity and tell Hughes Walter that she is the best person for the job, "even if" he has already given it to a Candy Striper. When Marietta confronts Hughes Walter, he immediately gives her the job, for she is the first person to ask about it.