Responses
She's not an idiot. It's not like she only wants to give milk, it's just that it's the only thing she can give. And also, when she was starting to receive snacks, she also shares it with Ditri. Even though milk and cookies won't make their tummy full, it still help them to not to starve completely and die ¯_(ツ)_/¯
I just started the novel and I kinda see how she could be a little bit of an idiot...milk isn't gonna fill his stomach. What did she expect?