To drop or not to drop, that's the question

Me and my best friend (H) have a friend who we want to stop being friends with, but we don’t know how to approach the situation. Insight would be appreciated. This friend is person A and our other friend is T.
Person A was our friend in yr 11 but we cut them off after they began to treat us in a babyish way, she’s really smart so it’s understandable we wouldn’t feel as smart with her around, but she always shoved it in our face, loudly telling us every single time we said something incorrect and correcting us, the way she told us we were wrong felt so rude especially the tone she used, it was pretty condescending. Even when we were right and she was wrong, she could never accept this. She even said to H one time that she’s glad to be friends with her and me since we aren’t ’that smart’ she feels less intimidated.
At the beginning of yr12 they gave us a half apology about their behaviour and I accepted it after H kept side eyeing me. But in my defence it was the first day of school.
she’s been known to lie allot, she’s also been known to do allot of stuff for attention. For example she’s cried in front of her science class so her teacher would feel bad for her.
Since she has lied allot in the past we don’t know if we believe her anymore. She claims to have been abused by her mother, she SELF DIAGNOSED herself with autism, anxiety and depression and she pretended to cheddar (SH) for attention. One time she was putting plasters on her arms openly in front of everyone and it was clear it was meant to covert the the cheddar marks. She has also claimed to have a ED. She once claimed multiple times for multiple days that she doesn’t eat, and her mum doesn’t care if she doesn’t eat. It felt like she was attention seeking. She’s also lied about being graped in yr 7.
H used to starve herself purposely allot, rarely eating, but luckily she’s gotten out of doing that. And i have a friend who does cheddar. We feel like if she is lying about this stuff it’s super insensitive to the stuff H has gone through and it’s also insensitive to my situation, it reminds me of my friend.
We’ve told one of the members of the safeguarding team about how person A does cheddar, and person A’s mother got informed. But person A doesn’t know it was us.
She also has a vendetta against H. For example one time in yr11, we were cramming for an exam and person A said smth that was not helping so H snapped at her accidentally because she was stressed. Ever since then, person A has been allot more obvious with how she doesn’t like H. Recently person A has claimed to be pressured to download a game by H even though she didnt. In fact, I was the one who said the most and all H did was agree and say “yeah it’s fun” ONCE. We found that person A hated H from the beginning but they liked me so put up with her to be my friend. She got jealous once when I told H something I hadn’t told her, when I am obviously gonna tell H more things cause I only have known person A for only a few months by that time id been friends with H for years. Person A had also messaged our other friend T about H, and she was speaking badly about her. Once person A had even called person H ‘weird and irrelevant’.
It may seem like we are victim blaming, but we are mainly doing this to vent. Me and H are kind of done with her but for me personally I don’t want to leave her if any of this is actually true, but at the same time I’m not sure if I’m going to snap at her one day too. We just want advice on what to do, whether we should drop her a second time or not.