She doesn't exist in real life, she is a fictional owl.
In the films yes, in real life no.
Hedwig Dohm died in 1919.
Hedwig Borzecka died in 1906.
Hedwig Lachmann died in 1918.
Hedwig Pringsheim died in 1942.
Hedwig Raabe died in 1905.
Hedwig of Holstein died in 1324.
Hedwig Dransfeld died in 1925.
Hedwig Weitzel died in 1971.
Hedwig Keller died in 1943.
Hedwig Marquardt died in 1969.
Hedwig of Nordgau died in 993.