。
She is looking for her car keys.
Literal
She [topic-は] her own car's keys [object-を] is-searching-for.
捜す (or 探す) — both readings さがす — means 'to look for, search for.' The two kanji draw a faint distinction: 捜す for looking for something lost or missing (a person, a hidden object), 探す for looking for something one wants to obtain (a job, a partner). Here 捜す fits because the keys are missing. The progressive ~ている marks the search as ongoing — she's mid-search.