She's blonde, sexy, and has the most incredible singing voice... I last saw her walking around this area. She didn't like mutants or ghouls, so she wouldn't have been near any of them. Nobody knows where she went. It's like she just disappeared.
Given she hates the super mutants and ghouls, it is safe to say that either the mutants or ghoul in Broken Hills became aware of it, killed her and threw her as food for the giant ants. Now her corpse lies there, gruesomely cut in half.