Why meee?!?!?!? Ughhh

So long story short I work in a office with a girl who smokes and I am 26 weeks pregnant. This girl walks out to smoke every 30secs which is fine whatever but you know whats the bad part we share an office space and I get sick while I am at work because of this? What should I do???😫😫 desperate here!!!

She also went to boss to say behind my back that she “ thinks” I dislike her... which is weird because I always say Hi no special treatment for anyone ...🤷🏻‍♀️