Me too! And though she was 'in the way' you defined her character in a most believable manner. She was so desperate to make things right, that she couldn't imagine another option to 'filling in' till ol' Lucius returned. I think any alternative would have left her with too much time to think about how bad things really were.
There is entirely too little of Narcissa in fanfic. I'd love to see some "Narcissa seeks revenge on Harry fic. Or on Lucius, or...pretty much anyone. A woman scorned. :)