I sympathize with your friend...if she has tried everything it may be worth it, BUT, suboxone is a MAJOR ***** to get off of, so I hope she's prepared and does her research on the costs and benefits. I am a former opiate addict and was on it for a year, and it save my life but the withdrawal was pretty damn uncomfortable.
I do have to say that my depression that year was better but I don't know if that is because my life wasn't so chaotic and in the depths of addiction.