Anxiety over someone at college

So, this is a bit of a long story, but bear with me because it's been a real rough ride.

I'm a college student starting my junior year in the fall. I took two gap years after high school due to injuries and mental health stuff. During those years, some pretty traumatic things happened, which left me with PTSD. On the bright side, that's when I found my soulmate,and we've been together for over a year now. We''re best friends too-we were before all this drama.

Now, there's this girl, let's call her Jane, who was basically family since she was two. We did everything together, had tons of photos and memories with our families too. Then one day, out of nowhere, she changed completely. She became toxic, changed her name, and stopped talking to everyone except for these new friends who don't like us much.

Jane started spreading lies about my partner and me before we were even dating. People started watching us like hawks because of her drama queen act. It got so bad I had to hide our messages and felt uncomfortable hanging out together. Even her brother jumped in, acting all protective and following us around. Now that she's at the same college as me-small campus, huge problem-I feel like I can't escape her no matter what.

She talks about our old drama to new friends while I'm there but not really talking to me directly, which is super triggering. It feels like every day, everywhere, she's around and it's hard to be comfortable here anymore. My social media was a safe space because Jane was blocked, but now she's back on campus.

So yeah, I've been having panic attacks,feeling anxious all the time, and just really struggling with everything that happened during those gap years resurfacing again. Any advice or support would be seriously appreciated right now.