At last--at last!" What should see do?
Should she go and call her father and put them to an open shame?
No.

Beatrice must come back some time.

The knowledge was enough; she wanted the knowledge to use if necessary.

She did not wish to ruin her sister unless in self-defence, or rather, for the cause of self-advancement.

Still less did she wish to injure Geoffrey, against whom she had no grudge.