Hi Dahlia_fields

BPD is a very challenging disorder. Sadly, certain people with this disorder indeed exhibit suicidal tendencies.
Quite some time has passed since you made this post, how is the situation with your sister now? Is she still making comments about ending her life?
She is your sister, yet it is clear that her behavior is abusive on various levels, including a threat to your physical safety.
Your own well-being is definitely the main priority, especially now that you have a baby, it is crucial to set and enforce/defend boundaries with your sister. This to protect yourself and your family.
But since she's your sister, I also understand your concerns for her well-being, particularly considering her suicidal tendencies. Has your sister ever gotten any kind of targeted treatment for her issues? Has she ever gotten any kind of professional help?
Take care

The Board Parrot