Hi Lee1151 and

Like you mention, this is good to hear:
My daughter is 25 years, lives on her own, and works full time. That I am lucky for .... she's fairly high functioning.
Did she do any college/university at all? Any other "typical", developmentally expected things -- graduated HS, got a drivers license, etc?
I have been dealing with this issue since she was 13 years old. In and out of psy placements / residential / self harm / two attempts/ awful boyfriends ...where I had to stay super close to keep her safe ... the list goes on.
Maintaining that level of support for over a decade would exhaust anyone -- no wonder you're feeling depleted

Is she still in any kind of treatment/therapy? If so, has she taken ownership for any of it (making appts, getting herself to appts, paying the copay)?
she does what I call a "hit and run / being zapped" attack on me. It's always me. I've been attacked three times this week alone for the most craziest things. My husband for the longest time blamed me for triggering her, but is now starting to see it. Which has caused lots of issues in our relationship.
How (that is, by what method) does she attack you? By phone? text? social media? something else?
Is there a "theme" to the attacks, like "you were abusive", or is the content pretty random?
...
When BPD is in a family system, it stresses even the relatively healthy relationships. My H's kids' mom has many BPD traits, and the drama and conflict and chaos going along with that has effected my marriage, so I understand what you're saying.
Have you and your H ever done any marriage counseling together? If not, have you done any counseling on your own?
It's OK to take care of ourselves first before trying to help other adults in the room -- therapy is a good first step.
Fill us in, whenever works best for you;
kells76