The cruise and dinner were the same day, it seems. They're wearing the same clothes.
So Nurie and Jill were in so much pain they had to be wheeled onto the boat. That solved Jill's problem, but Nurie had to sit. That couldn't have been comfortable.
Jill is so worried about Nurie's pain "there," but they still had to go to a restaurant. No mention of wheelchairs, so Jill and Nurie must have managed to walk in. Jill loves to eat at nice restaurants, so her knee probably felt much better by then.
I doubt Nurie felt any better. That must have been a long, painful, exhausting day