I mean maybe she smoothed her skin or fixed lighting or something.
We wouldn't care if it was on her skin or lighting but that show the big black area on her skin, not on her sign, which is the exact size of the sign she is holding. Trust me she just photoshoped it on, a lot of them do that with sign pics.
So if I airbrush a model it will show up black just like that sign when manipulated the same way?