Reilly put out a request on Facebook in late August asking people to send her grandmother, Theresa Smith Reilly, birthday cards to mark her 99th birthday.
Reilly hoped to obtain 99 cards, one for each year of her grandmother's life.
Theresa Smith Reilly served at Pearl Harbor as a lieutenant and nurse in the Navy during World War II.
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She returned to New York after the war and obtained a master's degree in Public Health from New York University.
"This was the 1940s, so kind of a big deal, but she thinks nothing of it," Reilly said. "It's crazy. I think it's important that we acknowledge their service and celebrate with them as they grow older and thank them for the sacrifices they made for us."
Reilly's request on Facebook gained more attention than she ever imagined it would.
Ultimately, Reilly said she received 550 cards from almost every state in the U.S., as well as cards from England, Ethiopia, and Australia in time for her grandmother's special date in late September.
She reports that cards are still coming in.
"Seriously, I can't believe it," Reilly said. "Gram is opening them slowly and reading all of the messages, each one nicer than the next."
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