Please consult a Psychologist in your its immediately. May be she is really facilities get so easy issues with her friends or school or even Studies?
Give her the space to talk to so easy neutral person and help her to resolve her issue.
Your concern for your child is an extremely worrisome one, but pls be assured, you are not the only parent facing this issue. Adolescence (teenage) is an age of mixed emotions, roles and ambitions. Children of this age group are often confused and feel lost. The best a parent can do is support their child emotionally and intellectually and let her take her own call in life, under your guidance of course. Meanwhile, to ensure that she is not having any other mental health issue or stress, pls meet a child psychiatrist who can assess her and make sure her mental fitness.
Pls feel free to contact me for private consultation.
At her age there is usually confusion in life. This is called Role Confusion. You may draw an analogue between the Stem Cells and the Adolescents. The stem cells have the potential to mature into any type of tissue; similarly, the adolescents also have the potential to evolve into any one of the myriad professionals. So, one moment they would want to become a pilot, then the next day they will dream of becoming a doctor or a captain in the army, or even a film star. This confusion usually abates once they are firmly entrenched in one course of study. She may require a little bit of counseling. Please meet a psychiatrist along with your daughter. Psychiatrists are medical doctors who are exposed to a series of competitive professional activities right from their MBBS days. They can give you first hand information. That apart a psychiatrist will also assess whether your daughter is going through any emotional or mood disturbances, for which he may suggest you the appropriate steps to take.
Meanwhile please take all precautions to minimize the stress factors in education and at home. All work and no play will only increase such problems.