We had an argument and I left to get some space
Yes, she will continue to be a very challenging person if you stay... . you would almost have to take a purely clinical view of the projections and have extremely strong boundaries (some folks have seen a diminishment of insults etc. after they show they will leave anytime it happens)... . and be very good at emotional self care. And be willing to do all that as part of staying with her. Sigh.
And NOT participate in arguments with her.
Ever.
Arguing with a pwBPD who is dysregulated is like arguing with someone who is drunk, it gets you nowhere, they are a huge waste of time and emotional energy, they solve nothing, and they are damaging. Walk, always walk away... . from any hint of argument with any drunk person and certainly anyone wBPD.
Take time and reflect on what you really want in your life long term. This r/s will always be very up and down.