Is my friend is starting to make drama so she can cut us off or am I overreacting?

Anyways, this is how much ive written rn. Tell me if i should add anything I (19M), my one friend, let's call her Hai (23F), and my other friend, Sai (19F), are all a part of a friend group. Hai and I were friends since the first year of high school, whilst with Sai we became friends in the middle of the second year. Hai and I were originally friends with another girl until the end of second year came, and there was some drama between Hai and her. Sai and I stood by Hai's side and defended her through everything. In addition, we made another friend around January, and by the time it got to december (the start of the third year), more drama sparked with her, Hai, and Sai. Lastly, there was also some drama between her and another boy from school, all of which she started. Not to get into detail about all of that, with the first girl we were friends; we lost contact because she spread around rumors and personal info that Hai had told her to people she wasn't close with. One argument that Hai used was that the girl had told me before we started being close. The truth is she never did; i just went along with it because Hai is my friend, and I didn't want to undermine her. In addition, Hai liked to do little pranks with that girl before we split up. I used to call them after I was done with school to see if they would like to hang out, and they would hang up on me without answering any questions, and when I would try to call them again, they would do the same. The next day when i confronted them, that girl said that it was Hai that did it, and not her. (Which i did believe; i just ignored it because it wasn't that big of a deal at the time.) After we dropped basically everyone else and it was only us three, we were fine and happy. Or so Sai and I thought. As more time passed, Hai seemed more and more distant. She always had said that after school was over, she would make new social media, get a new phone, and such, so all her "opps" or "random" people won't have access to her. We recently saw that she made a new snapchat account without adding us, she has deleted her user on insta, and the only thing she has left is TikTok, but she still uses her old Snapchat. There I saw something on her story that seemed a bit targeted towards Sai. It was a reddit post. So i went to reddit and found what she had written down, and I was right. But the worst of all was i saw another post that she had done, where she was trash-talking us, saying that we didn't get her a good gift or that we didn't use enough money for it. She used less money on her gifts than we did, and she said that our gifts weren't thought out at all, that they were silly. When she had specifically told us to get her some brainrot stuff from Temu, Sai and I went there and picked out the memes she liked the most. And because we thought that we should also give her something nice, we went to pandora and got her a charm for her bracelet, which she had named, and she said that she will start collecting them. Now I saw on the post that she didn't like the charm and called it dumb. (It was a yin-yang charm, and we said that we got it because we thought it resembled her personality, the happy and joyful girl but also the girl that listens to lana and wants to be all alone.) (Btw, the gift she got me was a CD from my favourite artist, but not of my favourite album, and most importantly, I don't have a CD player to play it on. I'm only saying this because she was saying that it was a well-thought-out gift in comparison to ours.) Now I and Sai have been talking, and I pointed out that when we hung out after graduation and Sai was an hour late because she had gone to her class party, which she had informed us about, Hai got mad and said, "no one is going to put me first; no one is here for me" (Even though i was right there) to the first girl we stopped hanging out with. Mind you, Hai was trash-talking her the most to us, and Hai was the most affected by that girl's actions, but she could forgive her so easily, but she can't forgive Sai for being a bit late? Sai and I think that she just wants to be someone's only friend, and that's why she is doing all this, out of jealousy. Last but not least, she has the habit of going and trash-talking you to your other friends for the smallest inconvenience you caused her, instead of telling it straight to your face. For example, we hung out during a break, Hai had some beef with some people from our class, and she wrote something in the class group chat. Right after she wrote what she wrote she left the class chat. Later she went to Sai and she told her that she got mad that i didn't defend her, when they couldnt even say anything bad to her because she left that gc. In addition Sai try to talk to her in preson and flat out said "is everything good between us" and Hai said yes, but later when Hai got a new number she only gave it to me but not to her. What do you think? Am I overreacting?

TLDR One of my friends from our group is being distant and starting to make excuses about how we treated her badly. She has started drama with two other people for the same reason, and it all feels like a recurring pattern. Now she is starting to make new social media and deleting her old accounts. I and the other friend think she is doing it out of pure jealousy that we have other people to hang out with and not only her, based on a comment she said to an ex-friend of ours. (That she made us cut off.) She also has the habit of going and trash-talking you to your other friends for the smallest inconvenience you caused her, instead of telling it straight to your face. So what do you think? Am I overreacting?