Hi, can anyone put my mind at ease/advise on what I need to do... my mother in law is staying with us for the weekend and she constantly vapes!!! We don’t want to tell her I’m

Pregnant as I’m only 4/5 weeks... it’s doing my head in and I’m constantly trying to get away from it as my partner isn’t saying anything to her even though I’ve told him it can be harmful... am I making a mountain out of a molehill? Or should i bite the bullet and say something? Shes going home tomorrow morning...