She said she was a body double for Tessa Thompson in season 2 or 3 of Westworld. Didn't mention any specifics other than she was covered in brown paint.
These are all of Tessa's nude scenes in season 2:
Shots from the back are Tessa, she obviously had a no frontal nudity clause in her contract. The only shot where she would need a nude double is the finale. about 9:40 into the video on that page. So while she hasn't confirmed this was the scene she was a body double in, it's the only one where Tessa would of needed a double. So we're 99% sure it's her.