Don't give her much credit. Someone marketed her and she made out well. End of story.
I'm no fan, but your claim simply isn't true. She is a self-made phenomenon. She started out as a news reader in Baltimore as a young woman, idolized Barbara Walters and worked her way up through her assertive personality to a talk show host appealing to the common humanity of white women as well as blacks, which made her a star. She has earned a reputation for large acts of generosity (although reportedly has no gift for the one-on-one). Due to her own business acumen she started the greatly successful television careers of Dr. Phil, Dr. Oz, and to a lesser extent, Nate Berkus. Love them or hate them, they have generated a pile of money.
But around age 40, she began to change, and started with the spiritual mysticism crap as opposed to the Christianity of the majority of her fans of either race, and was also apparently heavily influenced by her gay make-up artists and stylists. She was also attending Rev. Wright's "church" for awhile. And women who accepted her living with a man unmarried when she was younger started to lose respect when this situation has continued on and on, to the present. Any man who did this would also be disrespected by the married women who made up her core audience.
She was always politically ignorant, and when the Zero came along, she fell for the skin color thing. Too bad. Her ratings began to tank badly; then she left prime time and started her own station when her menopausal energies began to sag. Trouble ever since. Same with all celebrities who shoot off their mouths about politics and alienate at least half their audience.
She can blame racism all she wants -- the racism was hers in plumping for a political candidate who has turned out to be the worst president ever.
Revolutionaries in any "ism" -- communism, feminism, whatever -- all have one thing in common: they hit 50 or 60 and become exhausted with "the struggle" and see that Utopia is not going to arrive in their lifetime. Then they get bitter, and nasty.