Final answer:
The excerpts provided do not include information on Jeannette Walls' feelings after her father's death, thus an accurate answer cannot be given based on the given text.
Step-by-step explanation:
The question refers to Jeannette Walls' feelings after the death of her father, Rex Walls, as narrated in her memoir 'The Glass Castle'. However, none of the provided text excerpts seem to be from 'The Glass Castle' or directly pertain to Jeannette Walls or her father, Rex Walls.
Therefore, based on the information given, it is not possible to accurately determine the feelings Jeannette had for about a year after Rex died.
After Rex's death, Jeannette had a feeling of singular sadness and preoccupation for about a year.
This can be seen in the passage where it is mentioned that Lassiter returned in a mood of sadness and preoccupation. Jeannette's feelings may be attributed to the loss of her white herd and the precarious condition of her fortune.