It is good to see you are a very supportive parent.
Maybe she has not got kind of marks that she was expecting or probably something else is bothering her.
Speak to her and find out the reason what is she experiencing. She needs your love, support and above all confidence.
Next Steps
Consult a Clinical Psychologist.
Health Tips
Take her out. If you can manage take her out of station. Make her do activities that she enjoys doing. Stay with her through out the day.