LOL. I can certainly see how the "small bowl" conversation could be exhausting if you're having them all the time. On the other hand, unless her hands are broken or something, she could always just get her own damn yogurt and avoid the conversation altogether.
I very briefly dated a guy years ago who used to get mad at me because I wouldn't do what he wanted until he told me what he wanted. He didn't want to have to say "I don't want to do that, I'd rather do this." Instead, he wanted to say "Oh, well, okay. I guess. *sigh*" and then have me just know that meant he really didn't want to do the thing I'd just suggested and instead wanted to do something else. The relationship didn't last long. Personally, I'm a fan of literal thinking.