My friend is facing a continuous staring problem at the things and laughs during the time. don't use phone or tv or other entertaining things but only sit at one position for a long time stares forfive to six hours alone . started eatingso less ?

Your friend needs to be evaluated by a physician to determine the underlying cause of her behavior and what treatment is needed to help her.

In my opinion, your friend is exhibiting psychotic type symptoms seen in schizophrenia and must be seen,evaluated & treated by a psychiatrist as soon as possible. I recommend that you ask his/her physician to get the help he/she needs or take him/her to the hospital emergency room.