A girl from my old school started working at the same job as me I’m so bothered and annoyed by it

This girl was friends with my ex toxic evil friend and now when I look at her I get reminded of my ex friend and I think it’s something that I neeed to work on . Infact this girl at my workplace was such a bitch in high school aswell and she was so prestige. Even now she acts very prestige she was indifferent towards me and acted like she didn’t know me when we were at work. I said to her “ so your not gonna say hi to me “ and then she smiled and was like “ hi how are u “ and I just replied with “ good” . I’m just irritated that she is working the same job as me 😣