Tough one.
Humans are social creatures, and likely the congregation is her social outlet. That would explain the "doesn't care and wants to be back", attitude.
The fact is, most people do not approach either their beliefs or how they choose or choose not to practice them logically, as a first instinct. JWs are really no different in this approach. Her first instinct is to have social surroundings, and she feels the congregation gives her that.
Feeling type personalities are almost doomed to choose how they feel with respect to the social aspect, over logical argument. Thinking types fair a little better. I would still estimate maybe only 20% of those that actually quit attending actually perform the proper analytical steps to allow then to overcome whatever existential fears they are experiencing by no longer attending, be it social or otherwise.
Sadly, many are potential targets to go back because of this, even if they are out for years, or even decades, (I have seen this firsthand).
d4g