She'll need a time machine.
"We live in the 21st Century, that is, the 2000s. Similarly when we say "20th Century," we are referring to the 1900s."
https://www.khanacademy.org/humanities/ap-art-history/start-here-apah/brief-histories-apah/a/common-questions-about-dates#:~:text=We live in the 21st,we say 2nd Century B.C.E.