。
She expressed her ideas to the section chief.
Literal
She [topic-は] section-chief [to-に] own ideas [object-を] stated.
主任 (しゅにん) is a section chief or team leader — a specific rank in Japanese workplace hierarchy, typically below 課長 (section manager). 自分の考え (her own ideas) uses 自分 to emphasize personal ownership of the ideas. 述べる (のべる) means to state or express — more formal than 言う (to say), appropriate for workplace communication.