It was 'noble' of her to come forward with this information.
She married a man of 'noble' [='aristocratic'] birth/rank.
a 'noble' ideal/ambition/cause/purpose
(..) Almighty God, bless the insignia of Saint Sebastian the Martyr, that it may contribute to the sacredness of him to whom it is given. Do you, Michael, promise to be faithful to the noble purposes of this Order, to have a special care for the poor, the needy and those who are ill? I do so promise. (..)1990 The Godfather Part III