Please read and help dont know how to handle nc

Ok, my situation is quite more complicated as I asume No contact (NC) will aim at making her feel she has lost something but she is travelling for 2.5 months. In my case I have been with my gf for 3 years. She dumped me a year ago and I begged and pleaded to get backand cried and she said no a million times. It was not after I started ignoring her and dating again (2 months after the breakup) that she called me over 100 times and texted me 50 times in 40 min and ran over all of town to find me to beg me back. We got back and moved in together. First months were great but then the relationship got messed up and got really bad. I threatened to move out to get a reaction (she was cold as ice) and never did so that became part of our arguments. After that she went on a work trip and we argued over the phone, the fight ended in her telling me through a text to leave our flat before she came back. I begged not to for days and as she was firm I did as she asked. I am sure there was not another guy, she just got tired of fighting. I begged for her to tell me to my face and face things. In the end it has been a whole month of contact and me begging for her to meet (she met me and cried and all) but has now blocked me off her life by being really mean and saying really hurtfull stuff and saying that she does not have to share her feelings with me. She has accepted she does not see herself with another person now as she is hurt but that now after all the texting she is convinced she cannot get back (she has memory for all my wrongs only, not her wrongs or my goods). Everytime I tell her she wronged me on the way she handled things she goes mad. She is off travelling on leisure and bussiness for some time(she is back mid nov). And she has texted me once as her bussiness trip was going hell and wanted my support, stupidly I replied and gave it to her. Last night we had a chat and she told me she still cared for me a lot but couldnt be with me as she was not happy in the relationship and was sure of her decision (same as last year), she apologiesed for acting so bad and told me I was turning things on her, she misenterpreted all I said and turned things on me. I then begged for her to get back and told her all I would do differently and how we could be as happy as the first few months after we got back (I was very convincing and coherent), however as this was going nowhere I told her thanks and begged to stay friends and ocassionaly text (I want her to text so I can ignore her and start NC), she told me I was suffocating her and started ignoring my texts. Last year we had really good reasons to separate, this year not so much. My questions are: Is it too late to start NC? Would her having her mind distracted in her trip make her immune to NC (she is alone in a foreign country and knows nobody and is locked in her hotel room BUT will meet some friends exactly when NC finishes)? We have been texting for a whole month, has this made her break the habit of me? What is the best path to follow as she is travelling and how do I srike a balance between NC and her breaking the habit and forgetting me? How do I break NC whilst she is having fun travelling? Also the though of her kicking me out her mind by sleeping around scares me as this would really hurt (she is not this kind of person, I think)
My BD is at the end of NC, so I want to contact her 5 days before and see how she reacts as I dont want to give her control of replying to her first message on my BD. Plus I want to show her that I can be not needy before that and not just reply to a BD wish.
I also forgot that she will be with her firends in a month or so and she has really turned them against me so they will have a very negative input during her last two weeks of traveling.
Thanks

Jamie