When your older sister has mental health issues

Its honestly hard to listen to my sister right now. She is in full mania mode with dellusions and gets worse at night. I at one point had to block her because she is very intellegent and knows how to pull at the heart strings. My sister is bipolar and has borderline personality disorder with the addition of autism. Its not her fault for being a mess, but she went off her meds after being diagnosed with Autism. She is also 31 and believes she is leigion of many things and that she is fine despite asking for help, lying, needing money, no place to stay but her car, and going from calm phone call to a manic one in one breath. My sister also targets my mom a lot hence why I am scared to have her back home because my tollerance for her mental health lasted 29 years until it finally broke. I can’t stay silent anymore and just listen as my mom is being torn to shreds by her. Its hard enough listening her trying to fix what us not broken. I deeply love my sister that it physically hurts when I hear her over the phone. I know I can’t flee from it anymore. I don’t want the fight either but the ither option is to freeze which isn’t good either. This whole thing has caused my other sister to stress clean, my mom to have phone ptsd and lack of apetite, I don’t know about my dad, me and my brother are frustrated,, I’m making sure mom is eating and that I try to be understanding. Though I feel like my sister lost sight of us. I want her to come home, but I am afraid forvher to come home.