Aperson who loses weight by forcing herself to vomit after meals or by using laxatives, and who otherwise fits the definition of anorexia, is experiencing:

The correct answer is- binge-eating/purging anorexia nervosa.

Explanation:

Binge eating occurs when you eat a large amount of food very quickly which causes discomfort and loss of control feeling. Purging involves self-induced vomiting by misusing laxatives or other similar substances.  

Anorexia nervose is an eating disorder in which a person wants to restrict energy intake because of the severe fear to gain weight. So people with this disorder loose weight by forcing them self to vomit after meals or by using laxatives. Therefore the person is experiencing binge-eating/purging anorexia nervosa.