Why is my coworker lowkey a b! tch to me or does she just envy me?

I just got a new job at a clothing store and it’s like my first job lmao obviously when your new you get introduced to everyone at the job everyone I met was cool until I met this one girl who seemed lowkey cocky she was in the break room eating and I walked in to go to my locker and get my stuff out and she asked me “why do you still wear a mask” mind you there was other people also wearing mask there I just said I don't know im just use to it after that a few days go by and im back at work I finished cleaning my section and i grabbed a few things I wanted to buy before clocking out I make my way to the register and another person rings me up but that girl is right next to her and then she ask me if I know my discount number I tell her “no I don’t think the manager gave it to me” and she says “girl stop lying yes you did” like bruh who was even talking to you , your literally in another register , another time i decided to go out to eat during my break because it’s like a mall and when I’m done eating I make my way back to the store and she’s walking the other direction from me and she’s says “you on your break too?” I reply with a mumbled “yea” because I was really tired that day. Later that day we both were working near each other and she says “did you ignore me?” And i say “no” and she says “ I was about to say did this bitch ignore me?” And i just laugh it off but inside im just like wtf maybe I’m just sensitive but she’s too much lol or maybe it’s her personality.

Why is my coworker lowkey a b! tch to me or does she just envy me?
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