I've read a couple of the news articles about this woman, and it seems like she had an interest in trying to 'help' black people throughout promoting certain causes and advocating for civil rights. But personally, I think someone may have an easier time fighting the white power structure as a white woman than as a black woman.
In many settings, especially academic, when you talk about supremacy, colonial tendencies, prejudice, or even something as simple as racist stereotypes, it has been my experience that there is often some clueless modern white woman around, who worships political-correct doctrine and will leap on any chance to try to call you 'racist' over something stupid. Many white men and women are so unreasonable they feel personally attacked if you even point something out about the power structure, etc. Well, at least whites would probably listen and respect her more advocating for the same things as a white woman. Just a thought on that.
One article also clarified that the term 'transracial' Doleval is trying to use is not a real term the way she tries to use it, because 'transracial' apparently is a term already reserved for people who were born/raised into a race different from their own (being raised by parents of the race and usually raised within said culture also). With the version Doleval is trying to invent, people could just basically say they are any race they want to be. Then ofcourse, the real experiences of such races will become meaningless and risk becoming misrepresented as something they arent. It'd be a big circus.