Help!!!! i just found out my girlfriend is a drug addict!! what should i do?

ok so i met this older girls 2 months ago and we are both completly in love right now. a few years ago though she got in a real bad car accident and it messed up her spine. she is always in chronic pain and would be all day if she wasnt prescribed some oxycontin. so all this time i thought she was doing a regular dosage of one pill a day….until today. i found out today that she takes 5-6 40 mg of oxycontins, she rubs off the time release, then crushed them and snorts them! all of them. im talking about over 400 mg of one of the strongest pain killers out there! and she does it twice a day. this really disturbed me and if this wasnt bad enough i also found out that when her perscription runs out, she buys off drug dealers. she also sells them often. she spends hundreds of dollars a week on them. she is always extemly tired and often blacks out. she also has a history of cocaine abuse as well as ecstacy. i ALSO found meth in her house (but i dont think she does it). i am freaked out right now. the women i love is a drug addict. the wierd thing though is she is always taling down about drug addicts and her favorite show is intervention. what should i do? dump her? tell her to stop? report her? plz help. i love her but i find this very disturbing
oh and before i dates her, she was listed on craigslist as a callgirl (prostitute) to get money. when we started dating she prmoised she would stop but i caught her one more time after that. since then though she hasnt benn doing it

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