Fear is one of the biggest reasons someone joins and stays in a high control group. Fear of dying, fear of not being "spiritual" enough, fear of being disfellowshipped, fear of displeasing god (governing body), and perhaps the biggest one, fear of losing family and friends when one wakes up and makes the painful decision to leave. It is not any easier when you know what's coming. Keep reassuring her she is making the right decision.
When I converted back when I was a teenager I was told I would have a large worldwide family. Little did I know how conditional that love would be. Her family has been conditioned to show love only if she believes and does exactly as they say. THAT IS NOT LOVE!!! If that doesn't scream CULT I don't know what does!
She has our love and support as do you.
Reopened Mind, aka Mom