It is sometimes the case, not always, but sometimes the case that a person who protests TOO much about something and appears to stick to something, such as a belief, like glue, 'me thinks he doth protest TOO much', and really has strong doubts in their subconscious. Only time is going to tell with this.
If you can show her unconditional love you may find that in time, she will come round to your way of thinking.
When my husband told me he wanted NOTHING more to do with 'the truth' I insisited that I still wanted to go to meetings and be a JW but within a few months I came to my senses also.
As I said, you can never tell. If your girlfriend has had such a difficult life, it may be why she's sticking, or feeling that she want s to stick with the JWs at the moment, because it appears more permanent and the people are meant to be more loving, in theory.
Time, here is the secret. Watch and see, patiently if you can.