How did Squeaky change throughout the story, "Raymond's Run"?

At the beginning of the story, Squeaky sees her job as being the sole protector of her little brother, Raymond. Raymond is mentally challenged and Squeaky is willing to take on anyone who challenges or makes fun of him but she also sees her brother as somewhat of a burden. She does not see Raymond's potential as a runner. However, during the May Day race, she notices something for the first time. She writes, "it occurred to me that Raymond would make a very fine runner. Doesn’t he always keep up with me on my trots? And he surely knows how to breathe in counts of seven cause he’s always doing it at the dinner table, which drives my brother George up the wall." Squeaky realizes that even if she doesn't win the race, she can always coach Raymond and do other things herself. The realization allows Squeaky to also recognize the good qualities in her rival, Gretchen, and the two girls smile at each other. This implies a future friendship between the two girls and a realization that her brother also possesses talents. So Squeaky is freed to become both a friend to Gretchen and less of a protector and more of a coach to Raymond.