Is constantly talking about yourself a part of ADHD?

I have this female friend who said she had ADHD about which I don't have a good idea

However none of us treat her any differently nor does she show any signs of any indicative issue

But she often talks a lot about herself during 1 on 1 convos with everyone and also during chats with me and basically makes every topic take a turn towards her and sometimes there's also a self praising element. however, I never found it annoying but I guess it is something most people would consider cringe

Is constantly talking about yourself a part of ADHD?
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