Hi Doats and

Are you engaged to her? Are you planning on moving back in together?
I also saw that one of your goals was to demonstrate to her that she isn't alone and that you are there for her. Just remember, that people with BPD feel "alone" and like "no one is there for them" becuase of their own issues - not because no one actually is there for them. So, you can be there for her all day long and she still may
feel alone and like no one is there for her. If she has BPD her feelings often have very little to do with the "facts" as you see them. It can be a no-win.
It might be more productive, at least to start, if you focus on just taking care of your side of things - don't engage her in arguments, use boundaries, give her emotional validation, etc. The workshops in the Lessons are a good place to start.
Good luck and keep us posted!