Hi RSAJHB:
I'm sorry about your situation. It has to be very difficult for you.
Did giving birth trigger her BPD or was it dormant? I feel like I am living in a nightmare
Certain stressful life events can trigger BPD behaviors in some people. Usually, it is with people who are already on the edge and have had issues with anxiety, depression or other mental health issues in their life. They may not have ever had treatment for anything in the past, but perhaps their brain chemistry or wiring has put them close to not having the right balance at times.
A pregnancy changes hormonal levels and it's common for some women to have post-partum depression. Can you convince her visit her doctor? Some women may need to take an antidepressant for awhile.
How are things going?