Luna has always been underestimated and misunderstood, I feel. She is a remarkable strong young woman, and she fears very little this world can dish out. She also remains extremely loyal to her friends. Your depiction of her is very good. I love that you kept that quirky side to her alive and kicking, even in the face of torture and starvation. Well done.
Missing moments and deleted scenes, I love 'em! If ever there was a book that lends itself to having so many holes filled in by fanfiction, it's Deathly Hallows.
This is very good, and very well written. Luna has always been one of my favorite characters. You describe her anguish so well.