I was going to ask has anyone actually watched the show and maybe this could be fixed by just renaming the characters/show? To be fair to Disney, I've seen other shows with Black characters that didn't seem offensive in the last few years like Doc McStuffins.
I haven't gotten very deep into this, but her saying both her parents are Black don't mean anything. Her parents could be coons or she could have grown up primarily around White people which would explain why she didn't see the potential issue with this. Unfortunately, this is why having a Black person in the room doesn't mean anything if there aren't diverse backgrounds too. Being Black doesn't say you are culturally Black.
Im sure there was a White person who knew better but let it go because they had Black face to hide behind.