How about 'pretending to be Black'? After all that is all we know she has been doing. Making up terminology like 'transracial' is to begin to build a 'theory/framework' based on lazy/loaded assumptions.
I was referring to the previous attempts to draw comparisons with transsexuals. Again, what word would you have used to articulate that point (I was saying that such a thing doesn't exist AFAIK, to be clear).