HI Simbou44,
I am sorry that you are going through this. It is very difficult coping with both substance abuse and BPD behaviors.
How long has she been using speed?
Have you spoken with her about getting into treatment ? I find that ultimatums tend to not be effective. When you are coping with someone who has a two pronged issue, such as mental illness and substance abuse an ultimatum can exacerbate things. From my experience, my pwBPD ended up projecting and becoming very angry when I gave him an ultimatum. Learning communication techniques can really help with discussing difficult issues. Here is an article for you to look at.
Communication tools (SET, PUVAS, DEARMAN)Do you think that her current psychosis could be a part of withdraw or her mental illness?