WHAT SHOULD I DO HLP HLP?????

well my frnd she keeps cutting her wrist its lyk a drug 2 her she cuts it everyday whn ever she wants 2 if i take her poket knife frm her wats gona happen her parents dnt no this she not gona c a thresipst her moods chages soo fast lyk if she is sad she will be happy thn sad agin sumthing lyk tht soo wats gona happen if i take d nife away frm her she carry its every whr she goes !!!!!!