Re 20's = young, I thought so as well, but I think it can happen. It's been quite some time now, that I heard about her, so I'm not sure on the latest as she's in Queensland, me in the West, the Real Aust lol.
I know of quite a few bad reactions to the covid, within family, friends etc. One was at the beach, he went out to it, luckily there was a highly qualified nurse at the beach nearby, who resuscitated him and it was definitely covid related.
I had 2 jabs and apart from the tiny pin prick, no other effects, but I won't be having more.