。
She puts on airs of refinement.
Literal
She [topic-は] elegance-pretends.
~ぶる is a suffix meaning 'to pretend to be, to put on airs of.' Attached to 上品 (じょうひん, 'elegant, refined'), it becomes 上品ぶる — 'to pretend to be refined.' The ~ている form marks this as an ongoing behavior pattern. The suffix ぶる always carries a critical nuance: the person isn't genuinely refined, they're performing refinement. Other examples: 偉ぶる ('to act important'), 知ったかぶる ('to pretend to know').