This is the 2619th most frequent Spanish word.
desaparecida
Missing; disappeared.
Here, 'desaparecida' functions as an adjective describing the girl who was missing.
La niña desaparecida fue encontrada sana y salva.
The missing girl was found safe and sound.
In this context, 'desaparecida' is used as a past participle modifying 'star', indicating that the star had vanished.
La desaparición de la estrella desaparecida sorprendió a todos.
The disappearance of the vanished star surprised everyone.
Here, 'desaparecida' again works as an adjective, modifying 'friend' and suggesting that she is missing.