She's baptized.
When I first found out, I suspect she was pretty far in, emotionally, but afraid to tell us.
At first, she came on really strong with theological arguments; how bad the vatican is, (I'm not catholic, so I knew that was rhetoric) how bad crosses and flags are, (I collect crosses - my husband collects flags) and how the trinity is impossible (she used silly bumper-sticker arguments.)
I looked it up and gave her lots of websites and bible passages to consider. She SAID she read and considered everything.

I really think that it's not theological at all. Her husband abandoned her; she was lonely; she found some friends who accepted her. In fact, I think it started with a JW man whom she found online!
We never left her through all of this, but we're less than perfect too. Was she thumbing her nose at us? That's possible! There's more that I'm not going into. Life is complicated, and I think the JW organization offers connect-the-dots simplicity.
I don't know what's most important when a person considers becoming a JW, but I think it's not theology. I think it's the promise of friendship and/or a way to atone for your sins.

"There are three things I have learned never to discuss with people: religion, politics, and the Great Pumpkin."
~Linus van Pelt