Wild bad luck. Polio and despite vaccination she got Covid not once but twice and died of sequelei! And recently married. That is like lightening striking, again and again and again and again.
It might be more of a weakened immune system thing. Everyone gets small lightning strikes all the times, but our defences stop it before it gets too bad. So when defences are failing, you see a long string of random unlucky stuff happening .
Same for computer services going down regularly, or sequences of small industrial accidents, or even humans being non-stop unlucky.
The Covid vaccination doesn't stop you getting Covid, it just on average reduces the severity of the infection. Covid is still producing multiple waves a year despite the vaccinations. You can still get Long Covid despite vaccination, and you can still die from Covid even if you are vaccinated, thousands do so every week.
