What is the irony in the condition of Sanaubar's return in The Kite Runner and the significance of the quote "Time can be a greedy thing--sometimes it steals all the details for itself"?
The quote is from p. 226
The terrible irony of Sanaubar's condition upon her return to Baba's home is that she has been transformed from the beautiful seductress who "had tempted countless men into sin" into a "grotesque" and disfigured woman. Where she once turned men's heads--with
... a dimpled smile and a walk that drove men crazy... [that] No one who passed her on the street, be it man or woman, could look at her only once... (Chapter Sixteen)
--now she was a "toothless woman" with a face scarred by the repeated slashings of a knife. Another irony is that when she was younger, she deserted Ali and Hassan, refusing to even touch her son after he was born. Now, many years later, Sanaubar has voluntarily returned to see Hassan and ask for his forgiveness, and she makes up for her earlier lack of maternal interest by making Hassan's own son, Sohrab,
... the center of her existence... clutching that baby in her arms like she never wanted to let go. (Chapter Sixteen)
As for the quotation concerning time being "a greedy thing," it refers to Amir's inability to adequately picture Ali's
... frozen face, to really see his tranquil eyes. (Chapter Seventeen)
It has been decades since Amir has seen Ali, and the years have robbed his memory of an exact picture of the man who had been ridiculed as the "slant-eyed Babalu."