The truth of you--your blackness, your humanity, and the oppression you were experiencing at the hands of her Eurocentric culture--was more than she dared to even think about. Because if she'd really listened to you, she would have been forced to turn her back on everything that whiteness meant--her family, her privilege, and her naïve self-righteousness--and live with you in a world where everything she used to trust was evil.
I'm not surprised she couldn't face that kind of losses. Frankly, I'm impressed whenever anyone escapes that honey trap and wakes up to the painful truth of how American Christianity (at least its Evangelical wing) has sold its mission for a mess of pottage.