Perhaps Nigel ought to have married one of the clever ones, someone who would have known how to understand him and who would have been more entertaining than she could be.

Perhaps she was beginning to bore him, perhaps he was finding her out and beginning to get tired.

At this point the always too ready tears would rise to her eyes and she would be overwhelmed by a sense of homesickness.

Often she cried herself silently to sleep, longing for her mother--her nice, comfortable, ordinary mother, whom she had several times felt Nigel had some difficulty in being unreservedly polite to--though he had been polite on the surface.
By the time they landed she had been living under so much strain in her effort to seem quite unchanged, that she had lost her nerve.

She did not feel well and was sometimes afraid that she might do something silly and hysterical in spite of herself, begin to cry for instance when there was really no explanation for her doing it.