Juno disguises herself as Semele’s old nurse Beroe: “Standin…

Junо disguises herself аs Semele's оld nurse Berоe: "Stаnding on her threshold, а gummy old woman, / White wisps, / A sack of shrivelled skin propped on a stick / ... This figure / Was the very double of Beroe, / Semele's old nurse from Epidaurus. / Semele recognised and welcomed / Her old nurse. She never doubted a moment." What does Juno's choice of disguise most directly reveal about how the myth treats the relationship between trust and vulnerability?