。
She looked after a lot of elderly people.
Literal
She [topic-は] a-lot [genitive-の] elderly-people [genitive-の] looking-after [object-を] did.
面倒を見る ('take care of, look after') literally reads 'see the bother' — a vivid framing of caregiving as the active witnessing and managing of someone else's troubles. It's the standard verb-object collocation for caregiving in Japanese, used freely for caring for children, elderly, sick relatives, or pets. 老人 (rōjin, 'elderly person, old person') is neutral but slightly clinical; in everyday speech you might also hear お年寄り ('an elder') as a more respectful softer term. Caregiving for elderly relatives is a serious cultural and demographic concern in aging Japan — 介護 (long-term elder care) is a national policy issue.