After the expulsion of the Sudeten Germans, her family moved to Merseburg, Germany in 1947 where Grabner attended school until 1957.
Grabner has published a large number of non-fiction books, Essays, biographies and historical novels.
Her biographical works on historical persons include biographies of Mahatma Gandhi, Cola di Rienzo, Christina of Sweden and Gregory the Great.
[4] Together with Hendrik Röder she published books about Emmi Bonhoeffer, Henning von Tresckow and the Nazi opponent Hermann Maaß.
In 2003, Sigrid Grabner published her autobiography Jahrgang '42 – mein Leben zwischen den Zeiten (Year '42 – My life between the times).