"Apparate. You cannot Apparate?" She looks too pretty to be a Muggle but they can't all have smallpox probably. That means technically he shouldn't have shown her that but he hadn't really known she was a Muggle or for that matter that she hadn't seen him arriving, right, so it's only sort of his fault. Maybe Mexico's government isn't hardasses about things like that. Maybe they are hardasses about things like that and she will want to marry him for the exemption to the statute - okay, that's stupid.
She'd get along with his family, though.