I watched her Charlie Rose interviews-- and she seemed to have a sense of accomplishment but also a sense of mortality. She said to live each day to the fullest and I believe this to be true, so I hope she was living that way.
Her films were wonderful. You should netflix them if you haven't or go to amazon and buy one or two. I think, so far, my favorite is Widow's Peak she and Mia Farrow are marvelous in this film.
I think what I find saddest about her death, is her work ethic and ambitions must now be carried on by others. She was a real force in the fight against AIDS. Her father died from the disease, and she was one of the biggest propenents for amFAR to help raise money to find a cure for the illness.
She was also a Tony award winning stage actress. I think when someone dies and can no longer be seen on the live stage, is one of the saddest things in the world. I think most theatre goers and enthusiasts might agree with me here. There is no replacing an actor or actress who fills the room when they walk on stage. The stage and theatre are so intimate, emtional, jaw droppingly brilliant and irriplacable-- it's hard to think one could never have the opportunity to see a grand performance ever again.
In tribute to Natasha Richardson--I'd like to post this video of her work in the theater.
I hope her spirit carries on and wherever she is she knows how appreciated her work was (and in film/television, is).