I am thinking about maybe telling her I want to take her to dinner but in reality I drive us to a NA meeting...we don't have the financial means for rehab...she's in trouble and is my one and only. I cannot lose her....
I would not suggest doing that. All that could come of you trying to force a solution for HER issue is that she will get angry and alienate you.
I think therapy for you to help you deal with what you can’t control would be excellent. Also letting go of this secret by telling it to a professional might help before opening up to your family about it.
I am sorry you are going through this but please do take care of yourself and reach out for help. OF course we are all here for you but we are not professionals only people who’ve traveled down this road as well.