Do you have anything to back that statement up? Or is it just something you heard?
Ow, citations! Go to her correspondence, and not some edited nonsense—find a volume of her letters in the raw.
I remember reading these and she not only expressed sympathy for eugenicists, but offered rather harsh suggestions about reducing the number of blacks in the country, involving castration and other nastiness.
If you want to read REAL history, skip the publications and read the personal correspondence of historical figures. It’s like reading emails today. You find out what they’re really like.