I think my daughter is stressing too much

Your concerns about your daughter are valid and as you may think of them to be "silly" often times stress presents differently to those who are directly experiencing it. Stress, though a 5 letter word, is emotional and physical tension typically arising from the demands of life that one may believe to be complex, challenging or demanding. While you are afraid that she is stressing too much it is important to understanding from her perspective what it means to her to work hard in school. 

As a teenager the source of stress could function from school demands, frustrations of success vs failure, and even thoughts that arise about themselves, along with everyday pressures. Sometimes stress will "let up" and other times stress can become so overwhelming leading one to experience fight-or-flight responses as the automatic preparation that signals a sign of danger or threat. When this occurs natural stress can produce stress much more overwhelming and difficult to handle alone.

Luckily, you nor your daughter have to feel alone though you are experiencing some fear and uncertainty. To assist in keeping stress manageable it helps to sit down with your daughter and address where she is feeling the most pressure and overwhelmingness and consider a schedule that provided realistic goals, rhyme and reason. Consider practicing meditation, relaxation and breathing exercises that serve as the natural antidote to relieve stress. If there is some hesitancy or uncomfortableness of having this conversation, validate your daughter's feeling and loop in a therapist who can further provided recommendation and stress management techniques along with a variety of treatment methods.

Thank you for your courage to post this. Wishing all the best!