youre very right that you cant cure her bpd problems. realistic expectations arent just important, they are vital.
I have often tried to be accommodating to the best of my abilities.
what this means looks different for all of us. being accommodating, i would suggest, is a necessary skill, if you think of our loved ones as having special needs. being a doormat, on the other hand, is destructive.
when it comes to loving someone with bpd, theres a fine line between loving them, and letting them be the adult that they are; not trying to resolve their problems for them, and being an emotional leader when it comes to knowing their needs, and seeing the conflict between us and them in as close to an objective way as possible.
in other words, i think youre very much on the right track here. just some food for thought about the nuances when it comes to our loved ones.