Joanne was a raider in Appalachia prior to 2102.
Background
After Carol found a suit of power armor at the Monongah Power Plant and alerted Frank to its presence, she mentioned that Joanne may have found a fusion core for them to use. However, they had to come up with a convincing reason to borrow it from her.[1]
Appearances
Joanne is mentioned only in Fallout 76.