friend trouble

so I lowkey need some advice. I have this ex friend who was friends with me in my freshman year of high school, long story short she kinda became distant and overprotective of her new bf and our whole friend group fell apart. It's now my junior year of high school and she's not with the guy anymore but I have about two classes with her. I wanna kinda talk to her to talk things out because it was freshman year but I hear from a lotta people that she still holds a grudge towards me. What do I do?