How Can I Turn Her Down Without Hurting Her?

I was asked out earlier today by a friend of mine and she's had a crush on me for about 2 years now (I've known she just hasn't had the courage to ask before) but the thing is, is that I don't really want to date anyone at all, I haven't for over a year, I just want to set her down gently. She's one of those shy, easily embarrassed, into anime kind of girls. And since I haven't dated anyone or delt with turning someone down in over a year I've pretty much forgoten everything about it. So could

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