Fighting with Best Friend 😔 Please Help!

So my best friend and I are going through a rough patch right now and I don't know what to do. We've been friends since like 6th grade and we've almost never fought (We're gonna be seniors btw). A couple weeks ago she and I had a huge fight. She didn't talk to me for days and she avoided me at a party we both went to. We were texting yesterday and everything seemed fine, but then she brought up what we were fighting about and got all salty again! I tried to talk to her about it, but she just avoids it. I seriously feel so lost. She is my rock and I tell her everything, but now she won't talk to me.

Any advice?! I could really use it right now.