When there is environmental pollution it adds dust to water soil and sound because when pollution is added to water the water becomes polluted same on air, soil and sound. Which causes the soil to absorb polluted water and the plants that absorb oxygen doesn't get dust-less oxygen and as a result there growth is not good
first steps would be trying to talk or advising her to talk to someone trusted and if she doesn't feel comfortable ease her into healthy habits that could not only help her mental health but physical aswell