This should answer all of your questions and more. I've been educating myself about this recently, as my wife has this condition. I have been doing research only on the internet and I have been amazed at the information resources that are out there.
Http://www.Spineuniversity.Com/public/spin
esub.Asp?Id=36
there are several ways to treat it. However, I firmly believe that one important element of treatment that doctors often fail to suggest is simply understanding the condition and really educating oneself. I know that you just found out about this, so it is probably difficult to get into reading text on the internet for hours at a time. However, I can say from experience that it has been time well-spent for me (and I still have a lot to learn).
If I can direct you or help you in any way, please just let me know. Also, my wife has told me time-and-time again that my dedicated support thus far has really helped her. Your girlfriend will probably need some help emotionally while dealing with this...Until you are able to find the appropriate treatment and "make it gone". Good luck and feel free to email.