Hi jermom and welcome.
It can be difficult to parent a child with multiple diagnoses. Since there are different ways of treatment and managing a disorder, having a variety of them can be more confusing.
There seem to be quite a few ups and downs. Graduation, but job loss. Successes, but breakages of relationships.
It might be helpful to know that BPD is difficult to diagnose and has a strong comorbidity with other disorders. You may not get 100% certainty on diagnosis from even doctors, but here you'll be able to get some practical advice both regarding the pwBPD and as a person involved with the pwBPD.
I suggest you start with understanding what BPD is:
https://bpdfamily.com/content/what-borderline-personality-disorderThen you can consider understanding what it means to parent a BPD:
https://bpdfamily.com/message_board/index.php?topic=114267.msg1125525#msg1125525I look forward to your finding practical advice. I look forward to reading about the development of your relationship.