how to fix things between my sister 20M and i 18f ?

i’ll try to keep things brief because some of these details are very personal and painful to talk about.
me- 18F sister- 20

back in march of this year when i was 17 my mother had me committed to a psych facility for a few reasons, none of which warranted inpatient treatment, but i digress. the only reason worth mentioning is that my mother found out i was sexually assaulted by my uncle (moms brother) about a decade ago now and wanted to corner me into talking about it. the conversation as a whole was very unproductive in my opinion and concluded with my mom telling me i was a liar and made it up for attention.

obviously this incident irreparably damaged my relationship with my mother but that’s not really the issue here- i’m over that and don’t really want anything to do with my mom for now. following my very short stay at inpatient but before i moved out, i was admittedly very nasty to my mom. the worst thing i did was probably give the finger to him. i was only there like a month before i moved out to my dads, after i graduated high school a few months later i moved across the country with my boyfriend for the summer for his job (we’re moving about 4 hours away from my family in the fall for my college)

i guess my sister really took offence to how i treated our mom which makes sense. my sister and i already didn’t have a great relationship due to some other stuff. my sister did far worse things to my mom during her angsty teenage years but i didn’t hold it against her and i just don’t know what i did wrong with my sister or how to fix it because i don’t want to tell my sister everything and potentially ruin her relationship with our mom or have another person to say im lying about my assault i just don’t know what to do. right now my sister hates me according to our other siblings. she doesn’t reply to my texts either i don’t know how to fix any of this