In The Great Gatsby, what is the reader left to think about Daisy's emotional state and her relationship with Tom?

In one brief scene in Chapter VII, after Myrtle's death, Fitzgerald captures the essence of Tom and Daisy's relationship:

Daisy and Tom were sitting opposite each other at the kitchen table with a plate of cold fried chicken between them and two bottles of ale. He was talking intently across the table at her and in his earnestness his hand had fallen upon and covered her own. Once in a while she looked up at him and nodded in agreement.

They weren't happy, and neither of them had touched the chicken or the ale--and yet they weren't unhppy either. There was an unmistakable air of natural intimacy about the picture and anybody would have said that they were conspiring together.

There is a natural intimacy between Tom and Daisy, but it is not merely the intimacy of marriage. It is the intimacy between two people who share a common background and common values (or lack of them) and who move in the same wealthy world, know the same wealthy people, and observe the same superficial social conventions. Tom and Daisy are united more by their social class and its mores than by marriage. Nick observed:

They were careless people, Tom and Daisy--they smashed up things and creatures and then retreated back into their money or their vast carelessness or whatever it was that kept them together . . . .

What keeps the Buchanans together is that they are just alike. Both are amoral beings, users united by their mutual sense of entitlement. Both are far too selfish to love.

Daisy's emotional state at the conclusion of the novel? Surely shaken by events and frightened that she might have to assume some responsibility for her own actions, she retreats into the familiar and hides behind Tom and his money. They do conspire together in their kitchen while Gatsby, in great irony, stands watch outside to protect her. They will simply run away and leave it to others to "clean up the mess they had made."