she probably realized the story got blown out of proportion. she didn't make an indictment against the whole country of switzerland or even the store where the clerk worked. it was one person that treated her in a way that reminded her that being rich and "powerful" don't mean much when you're black.
basically her feelings got hurt, she said something about it and then the media took it to the nth power. now she's doing quasi-damage control because she doesn't want it to look like oprah whining about racism when white people been paying her bills for the past 20 something years.
And it shows she has no real power at all. She is APOLOGIZING after she was being shyttd on. Who else would do this??