Remember that addiction has a huge element of escape; addicts escape - they use their substance to avoid or obliterate reality, pain, stress, conflict, responsibility.
Many addicts, when their primary substance is removed, quickly latch onto something else - to escape - in an addict-like fashion. Sometimes it's another substance, sometimes it can be other compulsive behaviors such as excessive time at meetings or with certain people. It's another avoidance of life on life's terms in another iteration.
And, it has nothing to do with YOU, and all to do with the addict needing to learn life on life's terms. You, by insisting on normal courtesy, are getting in the way, between her and her latest compulsion, inserting yourself between her and her new iteration of addiction.
CLMI