Is my friend copying me or what?

well I got this mate and I love her to bits but I think shes coping me or something!!what it is , is that I self harm and am going through deppression, when I first told her about myself harm she was there for me but kept saying things like that she cud never do that, and a week later she had started!! when I told her what I done it with she used to same thing, also when I told her that my eating habits have changed and im not seeping all of a sudden hers have changed as well!! also ealrier this year I took an overdose and now she says that she wants to , I no she wont but thats not the point!! and also I tried to stop harming a few weeks ago and all of a sudden so has she, its jut that I thought I could speak to her about it all but now as soon as I got something wrong she has a well , and it dosent bother if someone copies me but something like this is different its deppression not something like coping ones style ,and I was just wondering if anyone knows why she is doing this!! I want to no for her sake I dont want her to act depressed!! please any advice will be more than grateful!! X