I think that one of the strongest examples of foreshadowing in the novel comes from Abileen's most foundational understanding of being in the world. She views consciousness as something that hinges on the potential for redemption and solidarity amongst human beings. This is seen early on in the novel and helps to foreshadow the elements that will shape it:
The thing is though, if I start prayin' for Miss Skeeter, I know that conversation gone continue the next time I see her. And the next..cause that's they way prayer do. It's like electricity, it keeps things going.
This is an element of foreshadowing because it is a concept relating to the novel's theme early on in the text and continues throughout it. Such an idea underscores Skeeter's attempts to help the African- American women as well as helps to underscore how Abileen will stand up for her own sense of rights, bringing out the element of "electricity" that exists within solidarity.