While Muu felt, indeed, better, she certainly didn't feel great. Everybody did something. Everyone was useful. But she? Nothing. There was nothing she could do. This was bad. The entire trip was terrible. Not to mention that the hag's words hurt. Even if they were true. 

Ultimately, Muu could only find some solace in the healer's words. She was a nice person. A [i]warm[/i] person. But these words weren't enough for Muu to gather enough courage to simply take some of the food. Too scared, she was, of the potential backlash of filling her belly as the one adventurer who had done no work at all.