What is the ruling on a girl intentionally vomiting after eating to avoid gaining weight?

It is not permissible for a woman to vomit after eating to rid herself of obesity if she can continue on a diet and reduce her food intake, because vomiting is harmful to the body's organs and a waste of money, and due to the Prophet's (peace and blessings be upon him) saying: "There should be neither harm nor reciprocal harm." However, if she is unable to diet and the harm from vomiting is less than the harm from her obesity, then it is permissible for her to vomit, acting upon the principle of committing the lesser of two harms. The estimation of the extent of harm should be referred to trustworthy Muslim doctors.