We finished our holidays with a few days at my mother’s who is a retired school teacher and takes care to speak a lot with our little girl. They both love looking at books together, and one richly illustrated fairy tale book is a perennial favourite. So there they were, looking at a story, and my mother was telling it by the pictures (because, really, fairy tales are very gruesome when you get down to it). “Look, and then he meets a granny.” (pointing to the granny)
My little girl: “C’est pas la même.” (The old lady didn’t even remotely look like her granny.)
When my mom didn’t react*, my girl corrected her sentence to: “C’est pas la gleiche.”
That’s a start. 🙂

* We’d specifically asked her to pretend not to understand our girl when she speaks French unless it’s an emergency.