Sorry your sister went back there - especially after so many years! What can I say? Certain people miss things about the religion: association? a certain feeling?
It certainly isn't me. I walked away. Any "good" feeling I ever had was just an illusion and as transitory as mist.
You say she is going to do things differently? She's going to have to end up being mostly a loner because the "trustworthy" friends she's looking for are rare. Maybe a senior citizen here and there fits the description you give. Anybody younger or in the "IN" crowd I wouldn't trust as far as I can throw them!
I wish HER all the best but quite honestly, I'd never tolerate any of this garbage now!