Hostess (Midnight)

The Hostess was a human who served the beings who wanted to go to the planet Midnight, via shuttle bus. When the ship was attacked by the Midnight Entity it possesed Sky Silvestry. She was the first person to suggest whether they should throw Sky out.She made her decision after she relised that Sky was Possesed and gave her life to defeat Sky becuase she had almost killed the Doctor.

After her death, the Doctor and the surviving passengers realise to their regret that none of them found out her name. (DW: Midnight)

The lack of an actual name but the presence of a 'the' suggests that the Hostess may have been, in fact, a Time Lady.