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Is she highly regarded as a singer?
Literal
She [topic-は] singer [as-として] highly is-being-evaluated [question-か]?
高く評価される is a set collocation of journalism and reviews: 高く ('highly,' adverbial of 高い) + 評価される ('be evaluated' — passive of 評価する). Together they mean 'be highly regarded, be well-regarded.' Add ~ている for the resulting state and ~ます for politeness, and you get the polished question 評価されていますか. The polite-register-plus-passive-evaluation framing fits a workplace conversation or interview about reputation in a field.