((((((((me05))))))))))) that's usually the hardest part, reaching out. Good for you!
Did she happen to give away any signs about how she's taken it? If she's taken it well, that's a good thing. Some people may not though.
Here's a good site that might help:
http://self-injury.net/stopping/talking/
If she wants to know more information about self-injury, you might want to recommend some books on the subject, rather than her asking you a million questions which you might not have answers to, or might not feel that comfortable answering.
There are a couple of really good books that people have left reviews for on PC, under "Ratings". You should check it out.
Hope that helps.