I don't think telling her straight on is a good idea. But also cutting them off, like others hint at, is a bit drastic. Could you maybe plan a trip together to a museum or some place with actual science experiments to see how they react to real world observations? That way you can naturally talk about those topics while you're there.

Thanks for taking the time to write your story, I'm smiling with the happy ending 🐱

This has been one of my wallpapers for years and it still makes me laugh, it's such a great picture

He looks so happy ◠.◠