Taylor Swift is expressing her gratitude for a fan who's put herself on the frontline during the coronavirus pandemic.A fan named Whitney -- who posts about all things Swift as @TaNnEytWiT on Twitter and is a nurse who traveled to work in New York City, the epicenter of the COVID-19 outbreak in the United States -- shared photos of a special delivery she got in time for her 30th birthday.She received a package chock-full of merch that arrived with a sweet letter penned by Swift."HAPPY BIRTHDAY!!