The Master's mother

	Time Lord
	Gallifrey
	The Master
	The Master's daughter
	The Master's father
	Masterplan

You may be looking for her fake counterpart.

The Master had a mother.

Trapped in a freighter, the Eighth Doctor jokingly tried to psycho-analyze the Master, saying "tell me about your mother." (AUDIO: Masterplan)

The Decayed Master used to blame his mother and father for being discontented and angry. (AUDIO: I Am The Master)