I'm not offended. I know nothing about your situation specifically, but I understand that you just want to help her. Common advice given to my parents were to give up, there's nothing you can do, but they never did give up and I'm very thankful for that. I never went to prison, but I've met many who did.

Maybe with a good facility it could be helpful, but most prisons are horrible environments with easy access to drugs. Addicts also die in prison, but maybe more common after being released for the difference in tolerance. Many are rejoining society with a massive prison drug debt, continuing the cycle.