Ms. Rosa was once a neighbor of the Sole Survivor. When the effects of the Great War hit Massachusetts, she and her son Chris were one of many in the panicked rush to Vault 111; they were denied entry by Vault-Tec staff and armed soldiers. Realizing they were unable to secure a place, she tried to use the fact she had a child as leverage, but that failed and they were left helpless outside the gates to the Vault. Despair eventually set in and they swiftly found themselves in the midst of nuclear devastation. They survived but underwent ghoulification and ultimately became feral. 210 years later, she still roams the Commonwealth and Boston alongside her son.
She was a customer of Hawthorne, a chem dealer who lived in Sanctuary Hills. She ordered Buffout from Hawthorne, who was unable to get it to her because wartime rationing had affected the Buffout supply as well.[1]
She was also a widow and was restoring an old Corvega with her son, who had been previously estranged from her. Their Corvega restoration project helped rebuild their familial relationship as well.[2]
Ms. Rosa can be found as part of a random encounter with several other ghoulified pre-War citizens.
The encounter with Ms. Rosa and the other ghouls can repeat, even if the Sole Survivor has killed them previously. These ghouls will level up with the player character, and may even change from one type of ghoul to a stronger type with each reincarnation, making them potentially extremely dangerous. They will always spawn together and re-spawn sporadically, meaning that even if the Sole Survivor falls to them in battle, defeats them, or if one simply reloads a prior autosave or quicksave, they won't be in the same place.
In cut terminal entries, it is revealed that her husband died and that she and her son Louis were rebuilding a Corvega together, strengthening their relationship after the loss. Louis wanted a roll cage and a leather interior for the car.[2]
A mailbox in the post-War Sanctuary Hills has the name Rosa printed on it. However, the Rosa residence was ultimately cut from the game.
