Claudia (Fallout 3)

 was one of the adults accompanying the children from Early Dawn Elementary at their field trip to Lamplight Caverns on the day the Great War broke out in 2077.

Background
After the bombs fell she and a few others ventured out into the wastes to search for help, never to return. It is not made clear whether she was a Teacher or one of the parent-chaperones.

Appearances
is mentioned in holodisks found in Fallout 3 but does not physically appear in any game.