Welcome!
When I went to al-anon they were very good about not pushing religion. They explained higher power etc.
I mostly wanted to share with you that my biggest support person lived very far away and I didn't even talk to her all that regularly. She believed in me. She had faith in me. She validated me. She was the voice of reality when things seemed crazy. She did this without pressure, without telling me what to do, and without criticism of me or him (which is good because when people criticized him I felt the need to defend him - which is crazy - I was defending things I desperately wanted away from.) It was such a force. I am much older then your sister but if she is anything like e, if you can provide that kind of support to your sister it would be very appreciated and give her more power to move out then if you flew down there and took her hand.