You don't know that. The article doesn't even say that.
When I was at the United States Grand Prix in 2000, there was a reported crowd of 250,000 people in attendance. There's a good chance that within a week, at least one of them had died. But to assume any deaths within a week were caused by attending the race would be stupid.
If you vaccinate millions of people, then statistically some of them would have died of other causes having nothing to do with it.
This one is a bit of a curious case. Of the people who may have died within a week after attending the Grand Prix, most or perhaps all would have an obvious cause of death where it is obviously not just from watching the Grand Prix. The same is true for deaths following a vaccine.
There have been 40 deaths within a week after a covid vaccine in the US that have been reported to the Vaccine Adverse Event Reporting System. That doesn't mean the vaccine caused the death, but only that it is possible that it maybe could have been a cause or contributing factor.
VAERS collects data on all possible side effects including those unlikely to be related to the vaccine such as urinary tract infection, cataracts, and sunburn. You never know if a vaccine might unexpected cause a bunch of people out in the sun for a short time to get a sunburn. It could happen. (There has only been one report of sunburn.)
The strange thing here is that she is reported as being a perfectly healthy person in her 30s. VAERS only has 9 reports in that age group. In this case there is no reported underlying health condition or cause. The family seems to have no explanation from the doctors for a cause.
After shot got the first shot she had some pain and tiredness, which is common. The day after the second shot she felt tired and ill and spent a few days in bed before things got worse and she went to the hospital. Her liver was failing. They were considering a partial liver transplant when her kidneys and then heart failed and she died.
It is possible that this was a vaccine-associated viscerotropic reaction. That has occurred with yellow fever vaccines, but is extremely rare. Something like 35 cases out of hundreds of millions of vaccines. There is also the difference that the yellow fever vaccine is a live-virus vaccine and covid is not. Also in cases where there was a viscerotropic reaction to a yellow fever vaccine it was a usually a reaction that initially was similar to yellow fever. In the instant case, there is no report of presenting covid-like symptoms.
I might hazard a guess that after the second shot she maybe had some pain in her arm and maybe a headache and ended up overdosing on acetaminophen (such a Tylenol) that led to a few days of illness followed by sudden liver failure. My understanding is that can be a result. Of course, that's just a wild guess.