The key to what you posted was."at this moment she claims black".
Next year or 10 years from now she could start to embrace both sides of her identity or even perhaps claim a different race. So she should be allowed to play both sides of the fence when it's convenient? is that what you're saying ?To be black there is no second guessing.you know it when you see it.anytime you have to put too much thought into it then its not black.
Yes, she can claim White or Black anytime she sees fit. Second, if it's an outsiders perspective, anyone not black will overwhelmingly see her as Black. White people look at her and think she's Black. I'm sure her experiences dealing with both races played a huge part in who she choose to identify with.