True repentance would involve admitting the root of her action which was to give a false account of a particular group. She knew them not to be racist, but invented a false narrative into the equation that defied truth. It's a "Thou shall not bear false witness" thing. And in that, I have yet to hear any apology.
When she comes clean and admits that the Zimmerman supporters weren't racist after all even though she tried to falsely portray them as such, then and only then will I accept her 'apology'.