"In the Year of the Boar and Jackie Robinson" by Bette Bao Lord (1984)
"Shirley refused to go to school for the next two days. Her mother thought it was because her eyes were almost swollen shut. Not so. Not so. Shirley needed the time for Mabel to realize that the Chinese had not squealed, and therefore her skin and bones deserved to stay intact."
Bette Bao Lord is a writer and activist. She immigrated to the United States when she was a child, and In the Year of the Boar and Jackie Robinson describes her experiences adjusting to life in America during that time.
It's a book aimed at young adults, and it's also super short, so I won't say much more about it. Suffice to say it's a very heartwarming story, and the ending had my teary-eyed. Wikipedia tells me that Mrs. Lord also wrote a few novels. I'll be looking for them this summer.