Why is my cousin copying my content on social media?

My cousin who is younger than me has this habit of copying my content on Instagram. I posted a mirror selfie the other day of me at work in a lift, and then a day later, she posts another mirror selfie wearing workwear and it is literally a copy of what I posted. I also realise that if I upload a post or a photo dump soon after she will upload a similar post to mine. I have also noticed that she never likes any content I post or supports my posts, but she has no issue liking or supporting other members of the family. At a recent family gathering she got drunk and tod me to 'go fuck myself' and stormed off and I felt she had a lot of anger directed toward me.

On the family group chat, she will make a point to ignore what I post, but will like and support everyone else's comments in the group.

What is her issue? Why does she copy what I post yet can't support me and is rude to me at family gatherings?

Why is my cousin copying my content on social media?
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