Preemptively addressing the "but how much worse would her symptoms have been if she had not been triple-vaxxed" tact

Excellent approach in this case

because it is silly and untestable.

Absolutely not - as she's not as severely affected, and we know this because of billions of jabs world-wide that have helped with the data about vaccines.

Severity of symptoms reported by patients is entirely subjective.

Not entirely. One can often see when people are visibly in pain and match that with what they're saying.

Being told to get vaxxed and doing it THREE TIMES already indicates someone who will go along to get along.

Not in the least. Everyone is advised to get each jab at least 90 days apart. It's not stupid to do so. It's stupid not to do so.

Such a person (assuming this is all not just scripted theater for the masses) is almost guaranteed to accept the notion that what ever their symptoms were that they would have been worse than had they not been jabbed three times in such a ridiculously short period of time.

That is indeed the science, rather than a notion.

(Sorry - I appreciate that I am the odd one here who doesn't conform to the anti-science narratives pushed by right-wing groups, as this anti-vax movement doesn't help anyone, other than a few filthy rich people who want COVID19 to continue to spread and make them richer.)