Is it normal that i want to unfollow/block my sister-in-law on ig?

Hey everyone!

So for the past 3 years my sister-in-law has been literally copying what i buy and the way i post on my social media. Our history/relationship isn't horrible but it's not perfect. At all. She's the oldest and a brat. Always at my mother-in-laws and thinks the revolves around her. She's 24 mind you. In her teens she was popular and modeled, not paid but just your basic alternative girl doing shoots in her home town. She's washed up a bit after a having a kid and just not growing up. OK so, our other sister-in-law (2) is a huge known copy cat and sister in law 1 would talk shit about her and even blocked her for copying. I recently called out sister in-law 1 for doing the EXACT SAME THING sister in law 2 would do to her. Of course she got mad and tried to play the victim and since i decided to be the bigger person and squash it sister in law 1 took that as i guess an "OK" to copy and now i'm thinking shes psycho.She started posting like me, dressing like me, has her like mine and even will phrase sentences and use emojis the way i do! Its really staring to eat at me and my happiness because everything i do and like is solely things i find on my own or come up with. I don't know whether to just block, unfollow or ignore her completely. Also, she uses people and shes copying my IG because i have a huge following with lots of likes, that i worked for and shes trying to get to the same... WHAT SHOULD I DO IS IT NORMAL TO BE SERIOUSLY BOTHERED??