Jenna Saras nude? - season three premiere of Black Sails

Jenna Saras nude? - season three premiere of Black Sails

I don't get this at all. Jenna Saras is clearly identified in the credits as the death figure, and that linked image does represent the death figure (I watched the episode), but Jenna Saras is not a black woman. She is quite white. (Also note that this white Jenna Saras is the one who played the death figure, according to IMDb.)

I first assumed she had been painted black to represent death in this "play within a show," but then I got to thinking about it - since this character is silent, this part could have been filled by someone in a one-time role, so why not just hire a woman who already has the right skin color, rather than hiring a white woman and going to all the trouble of coloring her skin?

Beats me. Something here does not add up, but I don't know the correct solution.