‘Sure,’ she said, long and sarcastic. ‘Just like you didn’t leave with her last night because you wanted to be the rescuer? Just like she doesn’t only like you because you put up with her shit without telling her to get the fuck over it?’
Rosie is both astute and cynical. She's not exactly wrong here, but it's a very cold way of looking at the genuine friendship between Caddy and Suzanne.