The worse her husband's evidence was the freer it left her to take her own course of action.

But it was no great comfort, for she was but little concerned about the harm he could do her.

Indeed, she was only concerned about the harm he could do Antony.
She returned to her search for a method of preventing that harm during her dinner, and after her dinner she continued that search without any success.

This injury to Antony, for her the central fact of the situation, weighed on her spirit more and more heavily.
The longer she pondered it the more harassed she grew.

The most fantastic schemes for baulking her husband and saving Antony came thronging into her mind.