Welcome to the board
I was not raised a JW but I ended up reading my boyfriend's literature (mainly the Paradise book) when I was 16 or so. I kept asking him questions and he was not interested in it at all even though he had been raised in it. I started studying because I thought I had finally found "the truth"! I had attended many different churches, spoken with people of varying religions and even my "worldly" parents had a minister come and talk to me about JWs. I was convinced I had found the cure to cancer and nothing was going to convince me otherwise. It was exciting and I fastracked baptism, pioneering, assembly parts, etc. My boyfriend ended up getting baptized with me at the same assembly.
Long story short, I wish I had read the book "CRISIS OF CONSCIENCE" prior to taking the plunge.
I skipped college, I dropped all my "worldly" friends, I alienated my family, I ended up marrying the first JW who came along because we were pressured to date only with a view to marriage and we wanted to have sex, ended up married at 21, pregnant at 22 and divorced/disfellowshipped by 24. No college degree, no friends, a low paying job and a single mom. It was drama. I ended up going back to that religion and getting reinstated a few years later only to realize after being reinstated that I was sick of being judged, sick of not fitting in, sick of constantly worrying about doing something wrong or displeasing God, sick of having no time for family, no time to read books or to have fun. I started seeing a therapist, I started going to debt management classes, I started concentrating on my career and I also started spending more time with my then 2 children. It was great! I got myself out of debt, I ended up with a better job, I was happier with myself and my little family became so much closer and so much less stressed/pressed for time. It was a journey and I am so glad I faded away from that religion some 6 years ago.
I, like you, believed the JWs spoke truth and I did not know where to go spiritually. I avoided God, the Bible, etc. for a long time because I felt unworthy and uninterested. I did not celebrate holidays, did not get involved in politics or the community and I kept trying to live my life the best I could. Slowly but surely though I started to see the flaws in the JW thinking, the flaws in their reasonings, etc. I have been reading the Bible recently and I am seeing more and more how the JWs just didn't have it right. They are so judgemental, so unloving, so unmerciful and so intolerant in my opinion! I know they try to do what is right because I was one and all I wanted was to do what was right. But wanting to do what's right and actually being right can be two completely different things.
In reading the Bible I am seeing more and moresoe that God is loving, that Jesus was approachable to all, that plenty of people in the Bible worshipped God and had a relationship with him without having to be part of a particular religion, without a manmade organization and without even the Bible. Why can't that be so today? Why do they say only 144,000 benefit from Christs' sacrifice when each and every person present at the Lord's Evening Meal partook. Jesus even said if we do not partake we have no life in us. I am happy to believe that I am worthy of having Jesus as my mediator, I benefit from his sacrifice and there are plenty of people who seek God and find him in plenty of different religions (or not). I no longer believe that God or "one truth" can be found in a religion made up of man's opinions.
I have been reading "CRISIS OF CONSCIENCE" and I have purchased "IN SEARCH OF CHRISTIAN FREEDOM" and it is not only sad but also liberating to see that the JWs are just another religion, just a manmade organization accountable for all they have taught and for the ways they have messed up so many faithful followers lives. You don't sound like you really care one way or the other whether or not they have "the truth" but IMHO you might feel a bit less like you're a bad person, less like you can't live up to their perfect standards, less like you will be destroyed along with all the other wicked people in the world at armageddon if you read Ray Franz's book "CRISIS OF CONSCIENCE". He is very sincere in that book and I imagine allot of what he says will ring true for you having been at Bethel and having held privileges of service in the congregation. He has lots of inside information and he really just brings out the fact that the WTBTS, the GB and the JWs are just a group of imperfect men proclaiming to represent God. I for one have come to the conclusion their claims do not ring true.
Best wishes in your journey. You are among friends. I hope your girlfriend finds what she is looking for and at the same time I'm afraid they will ruin her life in the long run if she does not find out the truth about "the truth".