Hello 4yrride and welcome to bpdfamily parenting board, I'm glad you found us.
I'm so very sorry to hear of your daughter's struggles and the exhausting rollercoaster you've experienced over the last four years. You are not alone, we understand - many here have similar journeys as you may have read, including me, I was where you are now in 2015. I so understand when you say things are uncertain, it's so much to take on board.
We can support you while you learn how best to support your daughter through the tools and lessons to the right of your screen. bpdfamily has helped me understand the broad umbrella of a BPD diagnosis and the context of where my daughter sits in the diagnosis (she is a quiet person with BPD) and what I can do to help my 28yr old adult. bpdfamily and members have provided me the knowledge and advice to ask the right questions with medics. Knowledge helps us make the right choices and decisions for our loved ones.
Have the medical team suggested dialectal behaviour therapy (DBT)? which involves learning how to manage emotional dysregulation through learning skills (2.5 hours a week) and a weekly one hour meeting with a therapist who is also available to the patient 24/7 by phone. If not - ask them, my daughter is a couple months into DBT as an outpatient and doing very well

. It's the recommended route for BPD.
My daughter lives at home, does yours? Do you have support from family members or friends?
I found the diagnosis immensely challenging like all members it's a shock, that said it's helped my daughter and I to do what we need to do and that is change our journey and expectations and be realistic of where we are, now.
We look forward to supporting you at this difficult time.
WDx