Hi Ravensong,
It is extremely painful to have an adult child who is addicted, especially if you have been unknowingly enabling them for a long time and suddenly want to stop being the enabler.
Addicts can get really nasty when you are no longer cooperative, including trying to make you feel guilty for their situation. They refuse to look at their own problem, instead deciding that YOU are the problem.
Don't fall for it. It will be tough, but she has to WANT to stop taking opiates before she will actually do it.
Take good care of yourself and your husband, and make your priorities your own well being. Your daughter has to grow up and become a responsible adult. Give her the kind of help that won't actually harm her, if you know what I mean. Making it easier for her to use is one of those things.
Good luck, and keep us posted.
FT