Hm, I think you may have misinterpreted what she said there... Here's a quote from the blog you linked:
Originally Posted by fireluxlou
But the For Darkness
cover? I think that does reflect the book. It’s probably the most accurate portrayal of a book I’ve ever gotten in terms of a cover [...] And though her skin tone is lighter than described, she is not depicted as being a different race
than she is in the book.
The cover she talks about changing is for a different book, because she thought it looked dated.
She says her character is white, with skin that goes brown in the sun. I guess that's still a case of whitewashing.