Is it normal to vomit all the time?

My 17-year-old friend Mel seems to vomit quite a lot. Each time I say something that displeases her, no matter where we are, she vomits. If she's sad, she vomits. If she watches a movie and it's fast and has action, she vomits out of stress. Today, I proudly showed her a picture of my new boyfriend (I am a gay man) who she hasn't met yet and she vomited. Clearly, she doesn't find him very attractive... But I was wondering if constant, daily vomiting like that is normal?