Just throwing it out there as you probably would know what would work best with your mate. Just have patience and the race belongs to the slow and steady.
Things that a person needs to be able to do to get out of a High Control Group.
Think Critically AKA Critical Thinking. It's not just a pase comment, it is a learned ability with routines to follow for it to be done correctly. I would learn some pointers myself (see youtube Qualisoup user account etc for videos on how to learn it) and then share the thought that all major purchases such as a house, car, insurance, etc require that we think critically and remain unbiased to truly make an educated choice, why would selection of a religion be taken any less seriously? Actually point out since a persons life (blood issue) is at stake, it should be taken more seriously.
The Jws and other Cults will always try to supercede the family member (that is trying to get them to wake up) to the punch by putting the phobia into their minds about "Satan will use family and friends to prevent you from attending meetings and having your bible study to prevent you from learning the truth" And when this actualy happens, they feel that the JWs MUST have the truth, since it happened that way. Now the person thinks that Satan is using you, without your knowledge of course.
So my idea would be to supercede that little game plan, if possible stating that Mormons, Scientologist, ( or what ever group you think, she thinks is a Cult) tell their new studies that if family and or friends try to stop them from progressing, it is Satan causing this to happen. Basically showing her that groups SHE considers a cult are doing the same thing the JWs are doing. Then let that percolate a bit. Then ask, Why would Satan allow family members of a person studying Mormonism, try to prevent them from being drawn into that cult? You should be able to find some online references to these tactics used by other cults.
I would also bring out that these other groups do not like it when the potential member researches the history of the organization, as they know that looking into their past will usually prevent their student from progressing. These group leaders many times EXPRESSLY forbid the members from reading information from previous members, even under penalty of being kicked out of the group. Why would this be true?
A Mormon Apostle J. Rueban Clark said "If we have the truth, it cannot be harmed by investigation, If we have not the truth, it ought to be harmed"
Here is the first video in a series that a Mormon made that shows how he was able to get out of the group using critical thinking skills. There are 6 in total.
http://www.youtube.com/watch?v=xrZkzLANdJU&list=PLCE83E900784110A0
Another point I made with my wife was posed through the following question " Why would a God who wants all to be saved allow his one and only true religion to make numerous failed predictions for over 100 years and allow this information to be recorded and made available for all "truth seekers" to find this historical information and make an informed decision that a God would not be backing let alone supplying erroneous information to these truth seekers" The Jws will tell her that Proverbs 4:18 explains away all the previous errors in doctrine as "new light" or that the light gets brighter. Ask her if Proverbs 4:18 was a prophecy being fullfilled by the JWs and it was being done by God providing wrong information over the years.
I would then ask her if EVERYTHING currently being taught was the truth and that nothing doctrinally would ever be changed again. IF not, then they are basically admitting that there is the potential for something being taught now, that is not true, just has been the case over the years regarding changed doctrines.
Sorry for all the rambling but felt that you might be able to get some reasoning points out of some of it for future recall.
NJY
