It wasn't cut, it just hasn't happened yet.Ah, a part was cut here. It will contain some guessable spoilers so I'll keep it on a tag. I'm not sure if it's good or bad it was cut, on one hand, it will increase the impact of what it foreshadowed, but on other hand, it removed a little character development from Nadia.
Nadia actually goes out with Naofumi and they get attacked by people trying to eliminate them from the tournament, and Nadia shows her power, and she confesses that she also tried to eliminate Naofumi by giving him one of those rokulu fruits that he likes in the drinks she gave him. Also, Rishia foreshadows Nadia's power in her investigations
That actually happens after the first few rounds of the underground coliseum, so it would probably happen in the next chapter or the chapter after the next.