Why is my coworker pointing out my mistakes and acting like my boss?

Anonymous
I work at a call centre. I’m quite new to the role, I’ve only been working there for about a month. A lot of the work I do is communicating with my manager and senior line manager through telephone chat.

There is this girl who works in the same role I am in, so we have the same responsibilities and both work the same job tasks. I’ve noticed recently though that she keeps pointing out every single mistake I make, and then always finds something wrong in what I do, and then asks to speak to me over the phone to explain why I made that mistake. So when I speak with her over the phone, she rants on at me for a very long time about what I need to do to improve for next time. She also keeps making passive aggressive comments about how my mistakes hold her up and cause her to fall behind in her work, because she has to spend her time fixing my mistakes. The other day she asked to speak to me over the phone to correct my mistake again and then said ‘I can’t spend long talking to you about your mistake, I’m going to the pub with my boyfriend’. I feel like it’s out of hands that she is fulfilling the role of my manager and telling me how to do my job, when we both have the same job role.

is this behaviour wrong and why does she keep pointing out my mistakes?
Why is my coworker pointing out my mistakes and acting like my boss?
3 Opinion