Even though we are addicts and alcoholics, we DO have a choice about taking the first drink or first drug. Yes, after that our addictive tendencies may overwhelm our choice-making, but there would be no one with successful sobriety if we didn't have a choice at all...
I believe you are guarding your recovery (and your space and your valuables and your safety). In sobriety, I don't let using heroin addicts live in my house, and that has nothing to do with their history of recovery. You can reserve the right to help her in a million other ways, or at another time in her process (when she gets some clean time back under her belt).
You can be kind and self protective at the same time. Self protective is not selfish.