I think there could reasonably be a link between the vaccine and people with existing health conditions like her known problem with seizures. She had one the day before she got the vaccine, didn't feel well the next day, and died a week later.

Given the link between the Oxford/AstraZeneca vaccine and brain hemorrhages, it would certainly beg the question of a possible causal link here (in the Johnson & Johnson / Janssen vaccine.)

I'm looking into it a bit further to see what the possible cause might be. For example people with a specific genetic condition that might cause an immune response to trigger a higher level of blood coagulation factors, which might in turn lead to clotting that could cause clotting in the brain, which in turn leads to increased pressure and bleeding, or could cause strokes, etc.

I'd also like to see if it's more strongly linked to a specific type of vaccine, like the single dose Janssen one vs the double dose Moderna and Pfizer ones... but the Oxford one is two doses and has been linked to brain bleeds so.... who knows.

I'll be keeping an eye on this, but for now I'd put this in the category of known vaccine risks for people with fringe medical conditions, allergies, etc.