Welcome,

So glad you reached out here, you are absolutely in the right place to begin to understand about Borderline Personality Disorder, what your daughter may be experiencing and get support and resources for yourself. This is a top notch resource for understanding BPD, clinicians consult here, it has oversight, it is safe and reliable.
There are a huge amount of resources here to learn if one wants to, but it can get overwhelming. I am plowing through and i am overwhelmed! There is a post at the top of this page that says how to make the best use of this site, which helps to simplify it.
Most of us really appreciate not feeling so alone in this, and make use of posting to each other along with learning.
So glad you are here, don't hesitate to ask for what you need. It is often a scary time with diagnosis you did the right thing finding support.
How long will your daughter be treatment? Yes unfortunately making poor choices over and over without regard to consequences is something that often happens with people with BPD (pwBPD).
Whew! daughter in treatment, good work, hope you can rest too. It is exhausting.
With Respect, DG