She had a thorough medical examination.

Literal

She [topic-は] thorough examination [object-を] received.

綿密な診察を受けた — 綿密 (めんみつ, 'thorough, meticulous') is a na-adjective. 診察を受ける (しんさつをうける, 'to receive a medical examination') is the standard expression for being examined.