Hi Momdoc and welcome to the group
You're definitely in the right place to connect with others who truly get it -- parenting a child with BPD of any age is not straightforward at all.
The threats, anger, rages, blame, instability, and emotional abuse will be very familiar to other parents here. Blaming others seems to show up across the spectrum of pwBPD (persons with BPD), and some parents say that's one of the most difficult aspects of interacting with their child wBPD.
My initial thought is that a key part of making it through this chapter in her life (I could see things changing as she gets further into her mid to late 20s -- college age is not "the age of reason" for most kids, sigh) would be for you and your H to have a strong united front about how to handle her threats, so that she can't play you off of each other, and so that you can support each other and endure these really painful times of her making poor choices in front of you.
How are you and your husband doing in your relationship with each other? Are you generally on the same page about how to interact with her, or do you have different approaches? When there's a pwBPD in the mix, it's not only that direct relationship that's impacted, but the secondary relationships, too. BPD can be hard on a marriage even when the pwBPD isn't in the marriage!
How have you dealt with her threats before? Does she seem to follow through on any of them?
This seems hopeful:
She has a therapist and a psychiatrist and has recently started the medication Abilify but, she still is very unstable and often very angry in her mood.
What would she say she's seeing the T and Psy for -- i.e., is there a diagnosis of anything, and if so, does she seem to accept her diagnosis? Is she generally compliant with treatment (goes to appts independently)?
Fill us in, whenever works for you -- we're glad you're here.
-kells76