Hi bee and welcome to BPD family. I'm truly very sorry this welcome and reply is late... .though glad you found us, apologies to you.
I'm sorry for what you are dealing with and going through, you are not alone. Many here relate to you when you say I can’t do this rollercoaster any longer, in fact thinking about it I guess everyone has at some point, that’s why we are here supporting each other on the journey.
You may have read this helpful article that sets out why your daughter maybe avoiding being 'honest' and what the family can do
Anosognosia and Getting a "Borderline" into TherapyI don't know how an accurate BPD diagnosis may be achieved without your daughter consenting to one ie the hospital suggesting/recommending to her while she was there recently as you say. One would have expected a mental health reassessment at some point though if your daughter is avoiding as you suggest. Does your daughter speak to you about her bi-polar, her diagnosis, her struggles? I have found the tools and lessons to the right of the screen immensely helpful improving my skills communicating with my daughter, taking small steps forward works
Communication using validation. What it is; how to do itMy 28yr daughter made a number of trips to A&E early last year and finally gained an assessment and diagnosis last July. She'd got to the end of the road - could not take the pain, she was hiding anymore, it made her take on responsibity to recover - which she is, so there is hope bee. And I have learnt about BPD through the extensive resources (still learning by the way) here and most importantly to exercise self-care for me. Do you have support from family/friends bee? Have you considered counselling for yourself, it really can help.
If your daughter questions her medication does she question the diagnosis too - she may be right! Would this be a way into her taking control - an avenue she'd be willing to explore - ie a reassessment? Earlier this year my daughter had a med change at her request - then realised that not taking anti depressants was the problem - now back on them she is stable.
Hope you pop back and see my message bee.
WDx