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
(..) What are you going to do? You wouldn't kill your old Uncle...? No, Scar. I'm not like you. Oh, Simba, thank you. You are truly noble. I'll make it up to you, I promise. How can I, ah, prove myself to you? Tell me, I mean, anything. Run. Run away, Scar. And never return. Ahh, my friends. (..)1994 The Lion King