How does Susie feel about her father going through grief in The Lovely Bones?

It is clear that, as the novel progresses and Susie's
father becomes ever-more frustrated by his increasing certainty that George Harvey
committed the murder but without any evidence to prove it, he becomes more and more
isolated and slightly deranged. It is clear that his inability to let his daughter go
and move on results in the estrangement that his marriage suffers. Susie is shown to be
incredibly protective of her father as he goes through this period of his life. Note how
she describes a scene in her father's study:

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In his low green easy chair he now felt the most
comfortable. It was where I often saw him sleep. The room like a vault, the chair like a
womb, and me standing guard over
him.

Susie explictly reverses
the normal father-daughter dynamic, as she becomes the protector over her father and
longs to see him move past this stage. The reference of the room and the chair being
like a "vault" and a "womb" respectively shows how Jack seeks protection and safety from
his study. The way in which Susie is shown to be her father's protector demonstrates her
own sadness and pity at how her father is showing his inability to cope with her
death.