"She will look well when she is dead." She gazed again for many seconds at the sleeping woman.
"But he will not see her, then," she added, rising to her feet and laying the mirror on the table.
She began to walk up and down the room as was her habit when in deep thought, turning over in her mind the deed to be done and the surest and best way of doing it.

It never occurred to her that Beatrice could be allowed to live beyond that night.

If the woman had been but an unconscious obstacle in her path Unorna would have spared her life, but as matters stood, she had no inclination to be merciful.
There was nothing to prevent the possibility of a meeting between Beatrice and the Wanderer, if Beatrice remained alive.

They were in the same city together, and their paths might cross at any moment.
The Wanderer had forgotten, but it was not sure that the artificial forgetfulness would be proof against an actual sight of the woman once so dearly loved.

The same consideration was true of Beatrice.