。
She had the bearing of a noblewoman.
Literal
She [topic-は] noblewoman [attributive-の] bearing [object-を] was-equipped-with.
貴婦人 ('noblewoman, lady of high standing') is built from 貴 ('noble, precious') + 婦人 ('lady, woman'); the word evokes a slightly old-world or literary tone, the kind of register you'd find in translated European fiction or historical drama. 風格 ('bearing, dignity, character') refers to the impression of refinement someone projects through their manner. 備える paired with を means 'to be equipped with, to have / possess (as a quality)' — distinct from 持つ (more concrete possession). The ~ていた form gives an ongoing-state past: she possessed this bearing throughout the period in question.