Spiritual Posession???

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My cousin is acting very strange, and odd markings are showing up on her body. She says she has NO idea where they came from, and some of them are just PERFECT lines across her abdomen. She has had a sudden change in behaviour and has stopped going to church, saying the bible is "nothing but a smut magazine for christians". This is not like her at all... I've heard alot about spiritual posession, but never really knew the signs. I believe strongly in spiritual things, however my religion needs work. I believe there are souls and spirits, but not necessarily a god. I will leave that for another discussion though. So what are some of the signs that someone may be posessed?? Please tell me, I'm worried about my cousin. She is not acting like herself, and marks keep appearing...