Friend not feeling herself… magic?

A friend of mine has not been feeling herself for the past 2 years or so. She gets angry over small things and feels a ''presence'' around her, which scares her. She did not know what the cause was, but recently a woman came to see her parents and told them about their daughter (i.e. my friend), who she has never met, and told them about her character and personality and other personal details and that her problems were due to someone doing black magic on her and that she did not come to any greater harm because of her worship of Allah (swt). I have a number of questions with regards to this.

1) what should my friend do to protect herself from this? As I have mentioned already she is a good person and regularly remembers and worships Allah (swt), but the problem has not left her. Are there any specific dua's to recite or measures she should take?

2) Secondly, this woman who gave this information says that she knows this because she communicates with a good jinn and she seems to know things which there is no natural way for her to know about people who have never met her. My understanding was that magic was forbidden not matter what the intention of the person using it. So should this lady get involved in such things?

3) Thirdly how do we deal with such people? Generally she is known to be of a good character and she is not known to use magic as a way of earning money (e.g. fortune telling at a price).

As-Salamu `alaykum wa rahmatullah:

Nothing good nor bad takes place except by the will and decree of Allah Most High. Even if all the satans of the world from the biggest to the meanest assembled to hurt a gnat it would not take place unless Allah Most High decreed it. Therefore stand fast on the commands of Allah Most High and ask Him relief of any duress together with following His commands regarding this particular situation as revealed to the Prophet, upon him peace, namely to recite Surat al-Baqara especially its last three ayats and the Mu`awwidhat for protection (last three Suras). The du`a is in the Adhkar under ruqya and/or ta`wiz and is: A`udhu billahi wa bikalimaatihi al-tammaat. As for the second question: knowledge of sihr or magic does not indicate that one practices it since many of the awliya had and do have knowledge that pertains to it and how to deflect its harm with the help of Allah Most High. This is evident also when there are no dunya ties involved and when the interaction is for the sake of Allah and He knows best. Was-Salam,

Hajj Gibril