After the death of her husband who is lynched by a gang of white men, Celie and Nettie's mother falls into a deep depression. She eventually marries Pa, and never tells the girls that Pa is not their actual father. As she lies depressed in bed, Pa rapes Celie. She dies early in the story.
The timeline below shows where the character Celie and Nettie's mother appears in The Color Purple. The colored dots and icons indicate which themes are associated with that appearance.