I'm sensitive to cigarette smoke. When I lived in an apartment last year, my bedroom window was just above an entrance. People would go out there to smoke (and talk loudly and generally bug me). There wasn't anything I could do about it, since the management did not have any rules about smoking outside the building (so I moved). Maybe you could talk to her. She probably has no idea that it goes into your condo. Maybe it would spark her to quit! At the very least, perhaps she could put a fan on her balcony and to push the smoke farther out before it drifts up.