No, I don't believe it is personal at all. It has nothing to do with her love for you. Addiction is very cunning and baffling. He brain has been rewired to sustain and protect her addiction.
Just know - You didn't cause it, you can't control it and you can't cure it. If love could "fix" our addicts, none of us would be here. She has to truly want recovery in order to have a chance.