Yea starts waning after a year but there is a phenomenon called back boost is that if you get reinfected a year later with another variant, this still boosts antibodies to the variant of previous infections/vaccs. I suspect she might not have conditioned to select individuals with no recent infections. Also happens in regular vaccines (maybe less in magnitude than mRNA, that I don’t know). Without this memory we would be toast and this lady does not even know this or does not know statistics. I hope she is not in some serious capacity for making healthcare decisions.