I stated in a fan-fic I wrote that her name is Befana and that she had been a housewife when the Three Wise Men came by and invited her to come with them and see the Christ Baby. She said "No thanks, I'm too busy. I'll ask directions when you return".
An angel warned the Three to take a different route home, as the evil king Herod intended to KILL the baby once they gave HIM directions. So they took the detour -and Befana never saw them. She waited for a very long time, and may still be waiting.
She eventually married Santa Claus and is now in charge of the Mediterranean operations.
Santa Claus gets his power from all the little boys & girls who believe in him, uses this power to control space & time, all the toys in one sleigh (space compression) and all homes in one night (time stretching).