What a strange world we live in. Nicole without the dolls is a flop, and the dolls without Nicole are also a flop. If they want to be successful, and make coin, they have to play a part in a (clearly) toxic relationship, whose toxicity is barely contained behind a facade of camaraderie, and the ship has to be run by an egomaniac like Robin. As someone who likes the girls, if I were in their place, I wouldn't go through with it. Melody was right to decline.