My Mom has BPD, how can I deal with it?

I'm 13 and my mom has BPD (Borderline Personality Disorder), I have 2 younger siblings when I visit her house that travel with me and I only see her 4 days a month. She has trouble telling the truth to me, and always blames relationship problems and other things on me, mostly since I'm oldest. I'm pretty sure the BPD was not hereditary and she got it from a hard childhood where she lost both her mother and father before the age of 4. It's really hard for me when I'm there because I used to have a really close relationship with my mom and now that I'm older and start seeing the BPD I cannot seem to connect with her as much. How can I talk to her to let her understand? And this cannot be inherited by me right? I want her to love me like she used to, and I don't understand what I keep doing wrong. The BPD is really starting to impact me, by putting an emotional toll because I feel that nothing I can do is right, even when I know I haven't done wrong and its just the disease. How can I stop feeling this way? Please help!