The lines from the poem The Lady’s Dressing Room by Jonathan Swift that would help the reader infer Celia’s social class are:
Five hours, (and who can do it less in?) / By haughty Celia spent in dressing; /The goddess from her chamber issues, / Arrayed in lace, brocades and tissues.
It is a satire about an upper-class woman’s dressing room. Women of higher classes tend to spend more time embellishing themselves than women of lower classes do. They care more about their physical appearance.
Credible would be
Someone who's credible is honest and believable. ... Similar to words like reliable and plausible, credible is an adjective that comes to us from the Latin credibilis, meaning “worthy to be believed.” A credible reputation is often earned through consistent good behavior and an overall trustworthy personality.
