Gary, I used to be an MS and Elder, my family was DEEP into the witnesses - elders, PO's, Special Pioneers, etc. I have seen it all... most of my family is now OUT thanks to my persistant fact finding mission. Only my mother remains, but half hearted at best - pissing your life away and acknowledging it is too much for most people to mentally comprehend.
In all my years in, and dealing with my own shit storm, you are making a GRAVE mistake. I make no bones about it, you will either join, lose your family - if you do not join, or end up leaving your family on your own accord with a bitter sour, taste...
Yes, if your wife is barely studying I would put an immediate stop to it. I would NOT allow your daughter to go with your wife even if she still insists. They are a wicked, evil group once you REALLy get to know what is going on. Unfortunately this takes time, and most do not want to admit they pissed their life away, and so they continue half heartedly. Plus you lose all form of "wordly" friendship and after being with the JW's for some time they become your ONLY friends. Leaving them means you are in the cold, no friends, no family (at least those who are members of the JW's).
No holidays, no birthdays, no higher education, tons of wasted time studying, meetings, field service, and it only gets worse the longer a person is in, and the further they want to climb the ranks - ALL a wasted time...
Does your wife REALLY know the history of this group? Failed prophecys? I suggest that you put your foot down. You have either two choices:
If your wife is a die hard you may have to show her proof, but that is a dangerous, slippery slope, and most often than not fails. Second choice, is you bar the witnesses from showing up on your property, forbid your wife from studying with them, even in secret, and threaten the elderette who is studying with her that if she studies with your wife again you will pursue legal ramifications (that usually scares them away). Forbid your daughter from going, make your wifes life a living hell (I know it sounds sad, but if she takes the JW bullshit, line, hook, and sinker your fucked, and in retrospect you will have wished that you did put your foot down and acted a little aggressive).
These people ARE NOT YOUR FRIENDS! They destroy families, and they suck you in with promises of paradise, all the while beating you up mentally that you need to do more in the service of "god". Stick with your own faith, Catholic, I believe you said. In the long run you will thank those that have warned you...
Trust me, I have no vendetta against the JW's (well my own personal betrail, thats another story). They have lots of nice people for the most part, however the organization that runs it will suck you dry, mentally, physically, emotionally, and perhaps even financially. PLEASE take my advice and LEAVE NOW, and GET YOUR WIFE OUT ASAP!!!
Oh, and for the love of GOD, burn all her JW shit - out of sight, out of mind... change your phone number, or at the very least block the number that the JW's are calling from. As Judge RutherFRAUD (very accurate name) stated if you stay in, you will either join (miserable life), if you buck the system you WILL LOSE YOUR WIFE AND DAUGHTER - THIS IS NOT BULLSHIT, BUT FACT.
One last thing Gary - open your eyes, the things you are describing is a pattern emerging that you are ALREADY losing your wife. Once she gets baptized it will get worse. If you do not join, you will always be the third wheel - an "unbelieving mate". If you finally open your eyes after this has transpired (it will be too late) and do show some resistance, you will be looked upon as lower than whale shit. The elders - those in "control" will tell your wife that due to her lack of mental, and "spiritual" security that if she decides to divorce you they will sanction it.