。
She took care of the patient.
Literal
She [topic-は] that patient [genitive-の] care [object-を] did.
世話をする ('to take care of, look after') is the standard collocation for caregiving, applicable across the full range — children, the elderly, pets, plants, even guests. 病人 ('sick person, patient') is a generic term covering anyone unwell, distinct from the more clinical 患者 used in medical contexts. Caring for a 病人 — whether a family member or hired charge — is one of the most familiar shapes for the verb 世話 in everyday Japanese.