She's probably focusing on the functional benefits afforded by staying in: the vast network of "friends" (so-called), the sense of belonging to a group (remember driving by a KH in a different city, and feeling validated and the sense of warmth/comfort gained by thinking you have built-in friends wherever you go, even if you don't ever meet them?), having a greater sense of purpose beyond work/eating (that JWs feel that all Worldlies MUST experience?), etc. Let's not forget the constant threat of shunning by family members for those who DO leave.
I suspect many JWs are hopelessly trapped, but are unable to escape, so take comfort in the company of languishing in an unstated shared misery: hence the joylessness....
Self-actualization is not so easy: if it WERE, groups like the JW would not exist....
Good luck, and realize that you cannot save the World, sometimes not even your own family... That's one of the corrupt misbeliefs installed by JW thinking: the message of "you're engaging in life-saving work!" It's an appeal to the individual's ego that's just as fake as anything else.