My grandmother has a PCA who helps her with bathing and meal preparation every day.

PCA 是 Personal Care Assistant 的缩写，意思是"个人护理助理"。Personal 指"个人的"，Care 指"护理"，Assistant 指"助理"。这个职位主要负责帮助老年人或行动不便者完成日常生活中的基本活动。