
What Causes Sudden And Major Change In Behavior Of A 13 Year Old?

Could be depression but need evaluation
Detailed Answer:
Hello thanks for asking from HCM
I can understand your concern. Sudden onset change in behaviour shouldn't be ignored. She has stopped interacting at home. Her performance is very poor in studies while she is an intelligent student. She has written in diary that she wants to meet her late mother while her mother is alive. This behaviour shouldn't be ignored. Though evaluation is needed but this could be occuring due to abnormal thought process.
Depression could be a possibility and should be ruled out. Observe her behaviour and find out any other symptoms. During teen age years a lot of females show change in behaviour but with increasing age the symptoms improve by own. Find out if she has any significant stress at home or at school.
This could be abnormal belief or delusion. Under abnormal thought process she has probably developed belief that her mother is dead. Please talk to her and ask about the things she has written in diary. She might become guarded and will not speak. Please take her for a psychological consultation. The possibility of this is rare considering her age. This will rule out any serious thing.
Thanks, hope this helps you please don't hesitate to ask again for more details.

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