... my 22-year-old daughter is now in a DBT program for young adults. It's a huge relief, but my husband and I still have encounters with our daughter that leave us shaken because of her anger toward us and her sister.
Great news that your daughter has agreed to DBT, well done her. It take a long time to change BPD behaviour, so the trick is to focus on the small wins. Measure it every 6 months.
You may know the anger is often directed at whomever the BPD wants something from. And they’re experts at triggering us, so I do understand how difficult this must be for you. So be sure to consider your own mental health too.
Using S.E.T. worked for us. "Support, Empathy and Truth" – even though someone with BPD may not use any of that. My daughter also found art & music very therapeutically and won prestigious award. What helped with her anger was going to martial arts, which got her into meditation and then Buddhism. She's gone from wanting to argue with anyone that disagrees to quoting Gandhi. Punk music to Enya. That took a few years.
She is a musician and dropped out of a prestigious music school because of conflicts with friends and because she felt none of the professors were helping her.
My daughter is currently at Art collage, also has adhd traits. I still have to organise her, but she's found a course where they see her learning difficulty (LD) as a super power and have specific systems and apps to help. There are employers that seek out theses creative superpowers and are better suited to deal with "artistic temperament" - such as Virgin, who started in the Music industry. Bill Gates etc... These places might have easier to understand tech for your daughter and more accommodating tutors / team members ?
If not expert patient groups tend to have the very latest, and given folk with adhd are good at research (and inventions) they tend to give evidenced based advise.
In our area there aren't any BPD expert patient groups - I was told they get too combatative, Imagine that ? I've taught special Ed and no one is "neurotypical" , labels are for accessing medication - which if you daughter hasn't done yet, will be well worth exploring with an expert.
Projecting blame away and giving up easily, are considered masking behaviour. Because if people tell her "it's easy" when she struggles, that daily humiliation will causes serious anxiety issues. Avoiding isolation and encouraging my daughter to mix in non toxic settings really helped her. Hope that helps, if not forget you ever read this.