What problems could a 13 year old have?

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My 13 year old cousin was found dead last Sunday. She hanged herself inside her room. According to her parents, she was all good when they went to church. They happily taken their lunch and later in the afternoon, they just found her dead inside her room. She was such a jolly girl, has a high dreams for her and her family and then suddenly this happened. I just couldn't think of anything that would push her to do such a thing. I hope she's in peace wherever she is right now. :(