Patience and understanding of the behaviors of addict women is confusing, though I cannot relate to your situation I do have a few words that you can take or leave.
My aunt an addict from about 16/17 to 35 years old was given every chance, sign from God, warning, and most importantly was given a child.
Lessons and morals....still not learned.
One day out of the blue, randomly and miraculously she went to rehab on her own. (Key phrase being, on her own)
There is no understanding what it may have been, but it happened and none of our family asks questions. We are so grateful that she is back in our lives and in her sons life.
I think that the female mind can be very independant and stubborn and when you add addiction into the equation its a mess.
Know and be happy that you were strong and pray and encourage those who arent and if they cant be then just know in time something good or bad will come from their choices but they are completely out of any ones control.
You made it. You did it. You should be proud.
Help and Support but you cant always expect change.