Maybe Makaria wasn't knowledgeable about the world and maybe she came across as childish and foolish to most, but she was not completely without understanding. When Freyr stopped speaking after mentioning his cellar, Makaria understood that completely. That was where the Other Thing had held him prisoner and had kept killing him over and over.
Makaria squeezed his hand gently to say that she was right there with him. She didn't want him to have to think about horrible things. Besides, it seemed like maybe Hades was starting to like him! Makaria knew that he would, he'd have to, who couldn't like Freyr?
"There should be some god party," Makaria thought out loud, "where everyone brings the wines made by their people. That would be so interesting!" Some people, she was fairly sure, didn't really make wine, but maybe they made other nice drinks.