actually she was probably a laugh by the sounds of it, she referred to him as "my own dear Nigger"
I am rather afraid my own dear Nigger will think I have forgotten my promise not to bother him, but I am sure he loves me & I cannot tell him how happy he makes me & how dearly I love him & thank him for all his affection which makes the happiness of my life more & more every day.
from Emma Darwin's memo about Darwin's religious doubts
apparently the "nigger" is a reference to Charles as being Emma's slave. She was clearly on some hilarious ironic racism shit, fair play to her.
