Welcome aboard here. I want you to know that I have read all of your posts.
In my opinion it sounds like you really love this girl even with her bi-polar, and are starting to understand the ups & downs of this illness.
Bipolar's need a strong support network. They need to be taking their illness seriously and they need to be in close contact with their psychiatrist so that they can be given the necessary medication adjustments when needed. Is she doing that?
Also they should be in close contact with a therapist so that they can work out on how they can manage their coping/behavioral issues that can be a strain on them and their relationships. You've already mentioned some of the not so good behavioral traits that she has.
With that being said, I hope she is taking care of these issues. If she is committed to these things, which are to be taken very seriously, I suggest that if you plan on trying to stay in a relationship with her, that you get as informed as you possibly can about bipolar disorder. Not only for yourself but so that you too can become an important part of her support network.
You're not married or engaged to her, so this is the perfect time to look at all these issues and her commitment to them before you enter into anything more seriously with her.
You said you have been reading the boards for quite some time. That is a wonderful start because people here are quite candid and honest about their relationships. You get a pretty good picture of what life would be like with someone who is not totally committed to their wellness plan and also how it is still an on going battle for those who are, myself included.
I have been married for a very long time and from what I know now pretty much been bipolar most of my life. I was finally accurately diagnosed about 5 years ago. Life hasn't been pretty, but both my husband and I have stayed committed to my wellness package and most of the time things are good, but it is not always pretty and can be very stressful on both parts.
So, you have a pretty good idea of what to look forward to. You have been given great advise so far so take things slow and see how things pan out.
Stress is a huge trigger and I'm sure your phone call was upsetting to her. I would suggest that you let her be, so that she can enjoy her last days in France without having to deal with your issue.
I think you should let her come home, regroup and then write her a letter letting her know how you feel and that you would like to get together to talk with her and that you will call her in a few days after the letter for her response to that.
It will give her a chance to read it, react to it and then some time to really absorb it and hopefully make the right decision that she feels is best for her.