Well, some in the south do drop the last e on words, and we hear it today in words like panettone or calzone where the "one" sounds like the English word tone instead of toe-nay.
But, the drop sounds more soft over there as opposed to over here. I can't really describe it well, but I hear the difference between a southern Italian and an American just ignoring the e.
But, hey, if she wants to get all snooty about "proper" Italian, then she should speak "proper" Italian.