She is also known as: St Noitburgis; Notburga of Eben; Notburga of Tyrol; Notburga of Rattenberg Her day is 14 September
She was born to a peasant's family. Kitchen maid at the house of Count Henry of Rattenberg at age 18. The count's wife, Ottilia, ordered her to feed leftover food to the house swine; she gave it to the poor. Warned about her behaviour, Notburga fed the leftovers to the pigs, and gave much of her own food to the poor. Ottilia saw this as a form of disobedience, and dismissed her anyway.
She became a servant girl for a farmer in Eben. However, when Ottilia died, the count rehired her, and she spent the rest of her life as a serving girl in his house. Worked with the poor. Miracle worker. Miracles reported at her shrine at Eben in the Tyrolese mountains.
Born c.1265 at Rattenberg in Tyrolean Austria Died 16 September 1313 Canonized 27 March 1862 by Pope Pius IX (cultus confirmed) Patronage: agricultural workers; farmers;peasants; servers; waiters and waitresses
You don't give a date for the gravestone - if it was pre-1860s then that may be why it doesn't say "St Notburka" as not yet canonized?... I speculate.