她侍奉她生病的母亲已有多年了: she has been attending upon her sick mother for years
殷勤: eagerly attentive; hospitable; solicitous 短语和例子殷勤侍奉 wait on sb. hand and foot; 受到殷勤接待 be accorded solicitous hospitality; 献殷勤 do everything to please; pay one's addresses to; 殷勤的男子 ladies'