Welcome to this Forum,
You have an interesting story, and from another viewpoint. Obviously you are very dedicated to your wife, to have endured so much right along with her. I'm so glad she is "out" now and feeling more emotionally stable.
Your wife was able to see the organization for it's true colors. Your mom, on the other hand, is still "in". The only thing you can do is show her a great deal of love and concern, and try not to let her "lifestyle" and "restrictions" weigh on you. No matter how old she is, she might really be thinking about things already. Obviously, she is aware of what your wife has gone through.
It is very sad, but so true, that people with serious emotional struggles, that become involved in a cult, are tramatized even further through it's self-destructive process.
It gets my stinger up sometimes:
It's so sad for those of us on the outside, seeing the borg for what it really is. We might be able to get a few good points across, but basically, we just have to set back and allow our loved ones make the choices they do for their own lives. That's what it really is--their choice. If we say too much about the borg, then they are all the more protective. Perhaps on this forum you will learn some helpful suggestions. We are all friends here.
I admire you for your devotion and dedication to your family. You certainly aren't alone in your struggles. Hope to see you posting again.
Sentinel