Doesn’t sound like she was, it seems to have been a surprise but IDK for sure.
There's just no telling. Could've been a stroke, heart attack, blood clot that broke loose, or even sepsis. There are all kinds of things that can lurk dormant in the body for a time.
I think people's experiences of the last few years have made them prone to assume right away that any sudden death is MRNA injection-related, based on what we've seen. And that's a perfectly reasonable assumption; it's just not the culprit in ALL cases.