AITA Roommate moved out suddenly with 0 communication

I (F19) was put in a random roommate selection for my freshman year of college. My (now ex roommate) roommate and I were completely different people, she’s a cali Bay Area party girl, tall, skinny, long blonde hair, unnecessarily mean, you know the type. I’m from the Midwest, a bit shorter, far more alternative, extremely introverted, not much of a drinker, and when I was entering college I was in the process of detransitioning so I still had some more masculine features and style from that era of my life. We had an immediate “as it goes” boundary where we had access to each other general stuff that was out until the other person said something. I’m a middle child and am used to compromising all of my belongings and spaces and she’s an oldest sibling and very obviously dominated her household and siblings. As time went on she became extremely close with the people on our floor and I to as well. I’m in a long distance relationship and have admittedly spent more time cultivating that to make sure it survives than making friends throughout the first semester. I noticed during semester 1 finals that my Roommate started being increasingly more aggressive towards me, snapping at me for joking about our homework while we were working, slamming the door and having a hard time conversing about room boundaries. We came back from break and everything was fine, I assumed it was just finals stress (she’s not the most motivated student and was facing the consequences of skipping more than three classes a week when we have 4) but three weeks ago I woke up, sat up in bed and she was waiting for me in a full face of makeup and outfit with her legs crossed waiting for me to wake up. She told me “get up, get ready, and we need to have a little chat.” I assumed it was another bout of aggression and I hadn’t taken the trash out or something. I came back from the bathroom and asked what was up and she told me she was moving out that day. She told me it was an unhealthy environment and gave me a list of everyone on our floor who knew and was helping her move, it was everyone who I still had to live with. In the next three weeks I have been isolated and bullied by everyone around me. No one talks to me, my ex roommate might as well have just continued to live here because she is outside my door every night until midnight (later on weekends when she’s drunk), and spends the day in our communal areas on our floor. She moved one floor above me with a girl she told me not to become friends with because she was “bad news” and I was falsely reported for mental health concerns and had to meet with a guidance counselor. I have not found a single reason she’s moved out, but somehow everyone l meet has managed to hear about the situation. (I got to a small private college, roughly 1100 people) I’m getting exhausted of people knowing more about this than I do, I’ve racked my brain for our past conversations about boundaries I may have crossed and have come up empty. AITA?