“Which when Arachne saw, as overlaid
And mastered with workmanship so rare,
She stood astonied long, ne aught gainsaid;
And with fast-fixed eyes on her did stare,
And by her silence, sign of one dismayed,
The victory did yield her as her share:
Yet did she inly fret and felly burn,
And all her blood to poisonous rancor turn.”
And so the metamorphosis is caused by Arachne’s own mortification and vexation, and not by any direct act of the goddess.