there is a difference between addiction and physiological dependence. Addiction has more to do with a psycholgical issue. Physiological dependence means the body now requires certain dosages of the drug to function, almost like a diabetic who requires insulin shots. Of course the 2 often go together, but not always. I am not an expert, but I have done some reading on this topic. It’s important to speak to professionals who have training and experience in these matters.
AH, it sounds like your daughter really has it together, despite her difficulties with chronic pain. I also think it is wonderful that she is open with you, and this is definitely a good sign as far as her addiction/dependence. True addicts tend to be very secretive about their problem. Refuah Shelaima to her!