Line from Rubén Darío's "Sonatina"
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2 Answers
Es lo que tu dices, hace referencia a que ella esta en silencio, triste, utiliza una personificación atribuyendo cualidades humanas a un objeto inanimado
Here's my guess.
The lively, resonant sound of the typewriter keys was now mute.
The normaly lively sound of her talking was now silent.
As Neox says an anology is being made with an inanimate object.
Old manual typewriters made quite a racket as someone was "banging out words", so it seems like fitting anaology.
Typewriter keyboard
teclado de máquina de escribir
Bear in mind this is just a guess.
Found a teclado from 1900 : )