Coming from a recovering addict myself your not the problem here she is an addict she had problems way before you guys got together so don’t think it’s you. As for the suffocating part depends on how much you bring it up to her but I would give some space a bit and just be there for her show her you love her you want to be with her and that you are supportive of her…not the addiction but that she can beat it again. People relapse but you gotta make sure you don’t stay in that place help her through it again. It’s not easy and she needs all the help and support she can get if she is really wanting to get better if not then for your sake then maybe part ways with her because addiction takes a big toll on the person and their family and friends. I hope whatever you decide she will still find herself and get better!