I think this might be a phase a lot of metal fans go through.
When I was getting into metal I did the whole black clothing thing. It's for attention if anything I say. I don't think you have much to worry about, she will probably get over it. I think th real problem is the fact tat she's listening to Slipknot
I could be wrong but if it is like it was with me she'll do this for a while and eventually realize it's retarded. I don't think music has a lot to do with personality. I mean I'm a fan of Cannibal Corpse, Death, Necrophagist, Children of Bodom, and a lot of bands that deal with death, I at least like to think I'm a nice guy.
Maybe you should talk to her about it though. But I think it will fade.
Best of luck though and God bless.
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