My daughter was diagnosed with Bronchitis yesterday (she's 4 years old) and also had a rough, raspy cough. She threw up thick chunks of phlegm mixed with thin mucous and it was greenish-yellow. Sometimes, it came up kind of tan-colored. (i know it sounds gross, but we're on a healthboard..)
The coughing makes her miserable, and along with everything else, she has fever, chills, and runny nose. If your friend has symptoms accociated with Bronchitis, she should see a doctor. They gave my daughter antibiotics and cough medicine. Good luck!