Inbetween: I think i would focus on three things. First off her feelings... be there for her and give her comfort so she feel she has a safety net. i think thats the most important thing. invite her out and be nice to her, take time of and be together, that sort of things.
in terms of raising doubt, i think i would try two things. Make sure she know that you think there are many apostates who are spreading misinformation and lies, and who are just proposing other religions... its the unfortunate truth, and it is much better that she hear it from you than that she is able to label all apostates into one category of "OMG Russel and teh freemasons are the same!!!!1" crazy people.
If possible, i would paint myself as having the view that the witness may have the truth, but you have by accident read some things other have written you just cant find answers to in the witness litterature no matter how hard you try, and you dont know what to do because your confused and afraid of X, Y and Z. She might identify herself with the situation, and the answer as to what you obviously should do might be clearer to her in that situation than it is on her own.
Second, I think you should work on the question if its good or bad to investigate ones own religion and check its really true.. spin it like if it is true, investigating it will make one stronger, and one can serve God with an honest heart.
Does God want his subjects to make sure they are in the truth? or does God want subjects who are afraid to investigate their own belief? and eventually when all cards are on the table it will be clear who are right and wrong. here are some good questions:
http://www.freeminds.org/psychology/cults/opening-the-closed-mind.html
Eventually, when she is ready, i think it is a good idea to try and sell her the idea if its good or not to read one critical book of the watchtower now she has read dusins of supportive litterature.. use an example of a mormon who only study mormon litterature. have CoC ready, perhaps as a gift you got from someone at work, just in case.
good luck...