She always eats her lunch at noon为什么还要用her

She always eats her lunch at noon为什么还要用her
She always eats her lunch at noon为什么还要用her

She always eats her lunch at noon为什么还要用her
此处"her"为"lunch"定语, 当然也可以省略,可用可不用

你爱用不用

不用her也行，她总在中午吃（她的）午餐。

用不用都可以