The jail scene at the end

I think it's pretty obvious that she just passed out, although she would have suffocated herself if she could. If there was even a slight chance that she could have hurt herself with the pillow the jail matron wouldn't have rolled her eyes and kept reading. It was all a dramatic gesture after which she passed out.

You would think if she was really serious about killing herself she would have have gone for the wrists rather than the finger! Nah, it was all a big dramatic, symbolic gesture.

The bottom line is that her "family pride" (making the suicide look like a murder) and having treated her sister so badly for all these years have earned her a lifetime in the slammer, quoting her play and babbling to herself. Of course, we don't see the trial, during which she could be acquitted because of physical evidence such as powder burns on Cookie's hand, etc.

But at the very least, her life is screwed, which is perfect justice for her character. Not only does everyone in town know that her mother committed suicide, but now they know that she had a baby by her sister-in-law's husband and her sister took revenge on her by not backing up her story. Plus, she has suffered the shame of finding out that Willis -- a man of color -- is a cousin (or somesuch)! The shame and embarrassment of these "deep, dark, dirty secrets" coming out about her family is the absolute worse fate that could possibly happen to a self-righteous, prideful woman like Camille, whether she ends up in jail for the rest of her life or not.

Life's a banquet, and most poor suckers are starving to death!