Like clockwork, here y'all go with a divisive red herring.
The song wasn't considered racist until a few months ago. On the flipside, most aspiring singers grow up dreaming of singing the anthem before a sporting event thanks to iconic performances from the likes of Whitney Houston and Marvin Gaye. Plus, this is opening night, it's quite possible she was booked before these protests ever popped off.
Why she chose to accept this engagement is irrelevant, the actions of the 76ers is what matters. They're blatantly saying "fukk your issues, we care more about not offending the racists who may be bothered by you simply proclaiming you matter"...let's focus on that.