Hortense

 was the teacher of Donna Noble's servants in Goritania in the 1780s. Donna got her to teach Jackie Collins books. She was also Donna's maid and helped to make her wedding dress.

When the Tenth Doctor believed that Donna would marry Rudolph, he asked Hortense if she would like to travel with him. She declined due to the fact that she was busy with her job. (AUDIO: Death and the Queen)