Why does my friend criticise me and never supports me?

I’m in a friendship group it’s me and two other girls. I’ve noticed that one of the girls in the friendship group always likes my other friends social media posts but she never ever likes anything I post. I know she sees mine too because she views all my stories I post. She also makes comments about what I post in person like “I keep seeing you going out on nights out and I don’t know how you manage to do that and function at work the next day. I couldn’t do that” except the other girl in the friendship group posts night out photos and she has no issue liking her photos and supporting her. In person she’s always complimenting my friend but she never says anything complimentary to me ever

We both work at the same job too, and when I first started the job she was bossing me about and pointing out my mistakes and sending them out in an email to my other coworkers which was humiliating. The other day I was hanging out with her and my other friend and then my other friend left to get a drink and she turned to me and said “if I were you I would stop bringing up the topic of work to Amy. I can tell she is getting sick of it so just be more mindful of what you say in future”

Why does she criticise what I say and never supports me?
Why does my friend criticise me and never supports me?
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