She had never felt jealous before.

When Countess Rosali talked and laughed with her husband, treating him sometimes as a captive and again as a victor, Dora never cared; but every smile on this woman's fair face pained her--she hardly knew why.
When Miss Charteris, under pretense of showing her favorite flower, took Dora away from the others, and condescended to her as she had never done to any other, actually caressing the anxious little face and herself offering to be Mrs.Earle's true friend, Dora's heart closed against her.

She only replied by faint monosyllables, and never raised her dark eyes to the face turned so kindly upon her.
When Ronald had taken his young wife away, Lady Charteris sat with her daughter in an unbroken silence.
"Poor boy!" said the other lady at length, "and poor Dora! This is one more added to the list of unhappy marriages.

How will it end ?" As she watched the sun set in the golden west, Valentine asked herself the same question: "How will it end ?" If any one had told Dora she was jealous, she would have denied it indignantly, although Valentine was seldom out of her mind.
From pure kindness Lady Charteris wished Ronald to paint her daughter's portrait; it was to be a large picture they could take back to Greenoke.

He was pleased with the commission, and began to work at it eagerly.