STEVEPILL- Good question you asked about why it took me so long. What kept me in the organization so long was FEAR and GUILT about exiting the Jehovah's Witness organization. The WT Society instills FEAR into us because I knew that once I left the organization my JW family would shun me just as your wife's family is shunning or avoiding her. And that is EXACTLY what's happened to me. My two JW daughters aged 28 and 26 have had NOTHING to do with me or my 30 year old non-Witness son for 11 years now. We realize that they are deeply indoctrinated and under the influence of WT cult mind control. So it helps us understand that they are not totally in control of their own authentic personalities.
If you get a chance I highly recommend reading Steve Hassan's 3 books on cult mind control so that you can understand what makes your JW lady's mind tick. Much of what Desirous of Change mentioned caused me to leave the organization, but I hesitated for many years as I had fear I would be shunned. I also had to re-educate myself with OUTSIDE information aside from WT Society information so that I could see there was NO reason for me to feel guilty about exiting the JW organization. Once I lost that fear and guilt it was a big burden lifted off of my shoulders. Your wife still grapples with that fear and guilt. She cannot totally let it go as she hasn't allowed her mind to access OTHER information outside the WT Society to reinforce her confidence to not go back to what she considers is " the truth ". She needs to prove it to herself that WT Society is NOT the truth.
I am happier now than I've ever been these last 11 years at age 55 because I have true FREEDOM of mind. I can think clearly without WT Society interference in my brain. So I hope this clears up some things for you or answers your question