You need to take care of yourself first, if you are not healthy then you are of no use to anyone, esp. yourself. She needs to do this for herself. You cannot do it for her, shame her into rehab or insist she get help. Going through her things is a violation of privacy and not the best action. There are other options than "therapy". NA is a great support system and are people like her so they will understand her.
If she wants it she will do it, excuses are not acceptable. Best wishes to both of you.