Hi firststep
I am glad you took this first step by joining our online community
In what ways have you tried to help your sister before?
BPD is a challenging disorder and can definitely affect people, it can take quite a toll on you dealing with a disordered family-member.
It becomes very clear though how much you love your sister and how much you want her to get better. At the same time you've also clearly reached your limit and need and want a change in your relationship with your sister.
We describe various tools on this site which can be very helpful when dealing with disordered family-members. The tools include communication techniques such as validation and S.E.T. and resources about setting boundaries, radical acceptance and mindfulness.
Has self-harm and suicidal ideation been an issue your sister has been struggling with before or was this the first time that she mentioned something like this?
The Board Parrot