Dont smoke around a kid period. Esp with toddlers they have NOT fully developed their lungs yet and thus are much more prone to infections etc.

Tell her to be a good parent and stop smoking around the kid.

I smoke int he house when my son is here, but I have window fan thats strong as hell and he cant smell anything. I also turn on our hood vent in the kitchen when I smoke in the house after he's sleeping and it moves 800CFM so nothing goes near him.