Madoka smiles - though it's a little awkward. After all, it feels wrong for her to be the one saying this to an adult, but.. on the other hand, it's just true, isn't it?

"It's just a story though.." Hence why it might not make entirely realistic sense. Though Madoka does assume their work was important in the context of the story - though she might not be able to think of the details in this moment.

"I think it's more supposed to show, um.." The girl pauses, seeming to think for a moment. Lightly pressing her fingertips against each other as she does so. ".. How precious love is, I guess..?"

That's what Madoka takes out of it, after all. It's why she likes the story. It's about the strength of love. About being reunited with the person you love. That feels important to her.