How could the Countess tell that Rose envied her the joy of holding Evan in the carriage there?
Rose, to judge by her face, was as calm as glass.

Not so well seen through, however.
Mrs.Evremonde rode beside her, whose fingers she caught, and twined her own with them tightly once for a fleeting instant.

Mrs.Evremonde wanted no further confession of her state.
Then Rose said to her mother, 'Mama, may I ride to have the doctor ready ?' Ordinarily, Rose would have clapped heel to horse the moment the thought came.

She waited for the permission, and flew off at a gallop, waving back Laxley, who was for joining her.
'Franks will be a little rusty about the mare,' the Countess heard Lady Jocelyn say; and Harry just then stooped his head to the carriage, and said, in his blunt fashion, 'After all, it won't show much.' 'We are not cattle!' exclaimed the frenzied Countess, within her bosom.
Alas! it was almost a democratic outcry they made her guilty of; but she was driven past patience.

And as a further provocation, Evan would open his eyes.