jinn? please advise

Assalamualaikum wa rahmatullahi wa barakatuh; Dearest Mufti sab, May I first begin by expressing my appreciation for all the work you are doing for the sake of Allah’s Deen. May Allah accept all of your efforts. Ameen A New muslimah has got in touch with me regarding an issue she is facing and I felt it best to ask for your advice rather than give my own advice. Her letter is as follows: I am writing this letter for some advice for a friend of mine. I have just reverted to Islam about an over a year and a half ago and I have a good circle of people I can go to for any advice on Islam but I have a personal predicament concerning a friend of mine that I need some advice for. Reverting to Islam has taught me many things and has been a true gift for me, as it has made my life a whole lot easier to deal with. One of the things Islam has taught me is that we should not turn a blind eye whenever anyone needs help. This brings me to my friend who is actually a Christian. I spoke with her and explained how I had asked for advice for her and how I've been told to write this letter. She gratefully agreed and provided me with some more details to aid me in writing this letter. Personally I have known her for years and she has become a very good friend to me. She is a very sensible and nice girl who is always willing to help others. But approx 2years ago she had just moved houses and one night when she was going to sleep she had experienced something in her house. It was a huge black figure in the shape of a man and it just walked past her wall but at the same time put her in a state of stillness; she explained how she felt frozen and could not move or talk. This carried on for a couple of days here and there and it kept getting closer until one night it actually came up to her. Every day she would wake up and tell me the next day and on that particular night, she told me how it had tried to suffocate her and again how she felt as if she could not move. On another particularly bad night, she told me how it had also elevated her from the bed whilst she was in this frozen state and brought her down again. I kept telling her to be strong and because my belief for Allah started even before I officially reverted I told her to pray to god. This would happen quite often but sometimes not happen for a couple of months. Now two years on she has moved houses and is much happier in life. Now thinking back we both realised that it all started after a certain incident where she had tried committing suicide through an overdose but was found and taken to hospital by myself and couple of other friends. But she still faces these problems here and there throughout the 2 years where it would come and go. Some of the experiences she had explained to me included her feeling someone drag her leg, someone slapping her on her leg, someone sitting next to her on her bed (where she had said she felt the bed go down as if someone had just sat down) and also where she heard a woman's voice asking her playfully like a child if she was ok and then laughing. The very last one that had happened a couple of days ago was when she heard whispering in her ear. She said to me that it was in a language she did not understand but it had made her wake up the next morning and spend the day crying, even though she did not know why she was so upset. In nearly all these experiences she always says how she feels frozen and unable to move or talk and always makes her emotional. Other than these experiences, there isn't anything wrong with her and she leads a normal life. She had told me how this has been happening to her since the age of 6 but stopped when she was 14 and not returned until now. When she was younger she used to see figures all the time and they would be in the shape of cartoon characters she had seen on tv. Her mum is a very humble woman who has a strong belief in god and Christianity. She had referred many pastors to her and a couple of days ago after hearing her daughter so upset she talked to a woman she knew who normally deals with things like this for them. This woman told her mum that her family had played with black magic (which is true as they lived in Africa and she told me how they live a very different life style) and had also told her mum that someone has cursed her oldest born (that being her) to die soon, obviously hearing this is very difficult for her mum and the woman had said that her oldest born should be dead by now and can only be living through her mother’s belief in God. Now personally after listening to all this throughout the 2 years and in building my knowledge in Islam I have always thought that it could be a jinn or some sort of black magic someone has put on her. This has lead me to think that whichever method she chose to try and get rid of this issue for her; she would find it difficult as she has not accepted Allah, and being a Christian cannot aid her surrendering to Allah and asking for his help. I always try and make sure I include her in my Duas and do ask Allah to aid her in getting rid of this problem but I feel like there could be more I can do. This is where I am coming to you for some advice in knowing if there is anything further I can do for her other than making Duas for her. I would greatly appreciate any advice you can give me in helping resolve her problem, or if you could perhaps give a taweez or maybe tell me if I could write some quran ayaat and place in her house. I do realise that her being a Christian is a big factor but I feel this will also give her a chance to open her eyes to islam. Please Help! I am also open to any more questions you may have. Jazakallah Khairan