In To Kill a Mockingbird, what does Calpurnia look like and what is a quote about her appearance?

Calpurnia is the Finches’ African-American housekeeper. 

Calpurnia has been with the Finch family for a long time. She has raised Scout since she was a baby. Ever since Scout’s mother died, she is the only mother Scout has known. She is an older lady. Scout describes her, 

Calpurnia was something else again. She was all angles and bones; she was nearsighted; she squinted; her hand was wide as a bed slat and twice as hard...

Calpurnia is the Finches’ African-American housekeeper. 

Calpurnia has been with the Finch family for a long time. She has raised Scout since she was a baby. Ever since Scout’s mother died, she is the only mother Scout has known. She is an older lady. Scout describes her, 

Calpurnia was something else again. She was all angles and bones; she was nearsighted; she squinted; her hand was wide as a bed slat and twice as hard (Chapter 1).

Calpurnia is better educated than most African Americans in Maycomb. She is one of the few who can read, and she taught her son Zeebo. We know Calpurnia is fairly old because her son is already a grown man with a family of his own. 

Calpurnia knows how to read because of her past. She has known Scout’s father for a long time because she came from his family’s land, Finch’s Landing. Scout's grandfather gave her the Bible she learned to read from.

“Were you from the Landing?” Jem asked. “You never told us that.”

“I certainly am, Mister Jem. Grew up down there between the Buford Place and the Landin‘. I’ve spent all my days workin’ for the Finches or the Bufords, an‘ I moved to Maycomb when your daddy and your mamma married” (Chapter 12).

Thus, Calpurnia has always been a part of the Finch household. When Alexandra tries to convince Atticus to fire Calpurnia, he refuses. He says Calpurnia will not leave until she wants to, because they need her. Atticus depends on Calpurnia. He knows she provides the balance his household needs because his wife is dead. Calpurnia teaches Scout and Jem morals in addition to taking care of them. Atticus does not believe Alexandra serves the same role. Her values are not the same as his.