She is young for seventh grade. She may not be able to carry the burden so behaving this way. If she has cleared class 6 nicely and has the intelligence to match her class you may continue but if not..pls make her repeat the class. It will help in the long run.She needs help. Please visit a child psychiatrist .

Check out if the problem is due to lack of interest in a particular subject. Try creating interest by making the subject more interesting, give practical examples. Also Try to develop a higher level of interest in daily activities, It will increase her concentration Give your child minimum of processed food. Make your child sleep on time Limit the use of television and electronics Be honest and open with your child—. If something is going on within the family, talk to your child about his or her feelings Also add routines in her daily activities. Lastly do not shout on her because of this, instead tell her, Lets improve this...