I can't relax in her company as I feel as though I constantly walk on eggshells to try and avoid triggering her anger at me. I honestly feel as though I am in an emotionally abusive relationship and it's killing me. Trying to get the right help for her has been and continues to be a nightmare. I have been try to set clear boundaries and have not been able to run errands for her lately due to my poor mental health. This has resulted in her emotionally blackmailing me and telling me to f@@@ off in a message. She will not apologize for this and is now ignoring me...
A motto here from years past is "Facing the Facts". To summarize your post, your daughter is disordered and acting out (harming others even more than herself) and you find yourself in an increasingly impossible situation.
Well, think for a moment you're about to start an airplane flight. What does the cabin attendant say? "In the event of an emergency, put on your oxygen mask before helping others." This instruction give you the right to take care of your own needs first or else you won't be able to deal much more with your demanding and disrespectful daughter.
People with BPD traits (pwBPD) are known to resist boundaries. So what we encourage here is that
Boundaries are by us and for us, that is, how you
respond to the other's poor behavior.
For more information, we have a couple Boundaries topics, among many others, on our
Tools & Skills workshops board.
Meanwhile, as you gain insight and education here in peer support and perhaps too in local counseling for yourself, you may have to temporarily step back from involving yourself as much in your daughter's chaos.