Slight tw: mentions of sh, and suicide, and eating disorder

Also, I'm on mobile so shits paragraphing and stuff is shitty.

We're both 16 btw, and I understand she definitely has issues, as do I.

A-hole -&gt; ex
B -&gt; the friend

Some backstory for context I guess?(skip this if it's boring)
I have this friend(call her B) which has definitely been depressed since she was 13, due to personal issues and an ex. But when she met this guy named A-hole(fake name) at 13, that's when she became worse. He was toxic, as was she, it just was a shitty rs. She loved him, he didnt. He used her for his own pleasure, and she didnt care. They arent dating anymore, but they still talk.
Ever since him, she's been self harming, getting angry at everyone who disagrees with her and him, and just overall a completely different person. Again, I know she had depression, and maybe other issues. But not as many as she sorta..says?

(ACTUAL PART)

(Ocd cronicals) [2020]

I have ocd. I've been diagnosed since around 2020, but have been dealing with it since 2017 when my dad died. I'm open about my condition, and openly rant about my struggles with it, on my private twitter, and only ever sometimes irl.

B knows this, and for whatever reason, after me telling my close friends and her, that I had ocd and stuff.. she sorta made herself act like a stereotypical person with ocd? Like she'd see my pens not arranged, and then run over and arrange them, and say, "sorry it just really stresses me out". Mind you, she's never done this before, only once I told her I had ocd.. 
Or if I share my struggles with ocd, she'd suddenly relate to everything i've said. Saying, "yeah same". Idk, just kinda fishy. What do you guys think? Am I just overthinking this.

[2021]
Around the last few months of 2021, is when she finally saw a therapist and got medication after trying to overdose cause of one of her exes not liking her back.

(Adhd cronicals)

B said the nurse(not therapist, nurse) said she had adhd. And I've known B for years now, and as far as I know she hasnt really shown signs of adhd, or talked about any issues relating to adhd. I know adhd is not always visable, or usually isnt, and I'm not trying to stereotype. I'm just saying this is the first time I've ever heard her brought up that issue having adhd. And she talks about esentially everything with me. And again, she wasnt diagnosed by a psychiatrist, it was one of the nurses taking care of her. (Pretty sure getting diagnosed with adhd is a whole process) After getting "diagnosed" with said adhd, is when she suddenly started talking about dealing with adhd 24/7, and how she could never focus and had to always fidget, or something like that idk.
But in recent months, she stopped talking about it.


(Eating disorder cronicals) [2021]

I have OSFED(eating disorder), and it started in the start of the first lock down in 2020. I'm still trying to recover, it's been hard, but my therapist and friends have been really helping &lt;3

B again, knows this. And she knows ANY talk of dieting, eating, weight loss, starving or ed talk is incredibly triggering for me. Even just bringing this topic up is hard. (Not really relevant, I'm just upset she doesnt care about my triggers) 

Once I opened up about dealing with an ed, after ending up in the hospital, B decides that she wants to start having it i guess lol. Literally a day goes by, and she starts saying how she thinks she's sorta fat and wants to lose weight by starving herself in front of all my friends. First of all, triggering. Second of all, where did this come from. Obviously I and my friends were concerned, and we talked to her about it. Nearly everyday she'd say, "I wont eat today cause I'm just so fat", and then I have to esentially beg her to, and she'd go about her day. It escalated to me having to ask her if she's eaten everyday. I was being over the top, I know. But having gone through an ed(still do), I dont want any fucking person to ever go through it as well. Especially a friend. 
(Tw, TMI) I purge. Once I told her I did(she asked me if I was alright, so I ranted a bit), and literally not a day goes by and she posts on her twitter that she purged cause she hates herself. She definitely has issues, no doubt.
My main issue is that it's kinda fishy she only talks about it after I talk about having an ed..


(BPD cronicals)
It has finally come to the most current issue. And honestly the reason I decided to come on here.

Today, B told me how she has bpd, and she's lately been having a hard type dealing with it. First of, w h a t, secondly, when?

Allegedly, her therapist said she has bpd. Now idk if i'm wrong about this, but dont only psychiatrist diagnose you, or like properly diagnose you? and therapist can just refer you to a psychiatrist? Idk. 

And her having bpd could honestly be true. I wont go into detail why, mainly cause I dont wanna assume what it's like to have bpd.

But part of me feels like maybe it's not..true? Again, i really dont want to generalise bpd, but in the many years of knowing her and seeing her at her lowest lows and everything, i just dont really.. think she has bpd? I've read up about bpd, and one of my family members has it. Please tell me if I'm being an absolute asshole, and am the reason why people with bpd have to deal with people thinking they're faking it. 
I just dont really buy it, because the way she talks about having bpd, and talks about it, sounds like she's reading a list of symptoms of bpd you can find on google.
Also I dont know if you can suddenly just develop bpd out of nowhere? Or am I wrong.
Please, if you think i'm wrong about this, feel free to tell me in the comments.

And plus, with her history of just sorta "oh you have that mental illness? it's now mine", it's hard for me to believe her.

Obviously I havent told her any of this, and I've never brought up to her about her faking or anything. I'm trying my best to be supportive and there for her.

I just need someone else's thoughts on this, and if I'm just a bad friend thinking crappy of another friend.