Well Anvil. is one up on me, I know of no one that stayed sober after attending SS. Over these many years I have met lots of folks that tried SS but not a one stayed sober. The ones I have met, did later find recovery, through some of the more 'well known programs' like SMART, AA, etc.
I am glad that you have "Plan B" in the works. Keep your appointment. Even should she come out 'dry' from SS, it is still going to take a lot of work on herself, to change her actions, and that takes a long time. Maybe, somewhere down the line, if she 'embraces' sobriety and works on herself y'all may be able to 'rekindle' your relationship and maybe not.
Just remember, we are here for you, and you can vent anytime you want or need to, as I am sure those will still be coming for a while.
Glad you are looking out for you!
Love and hugs,