她正在做菜英语可以用 "She is cooking" 或 "She is preparing a meal" 来表达。

"Cook" 和 "prepare" 都是动词，意思是制作或准备食物。"She is cooking" 和 "She is preparing a meal" 都是在描述女性正在做菜的情况。

例句：

She is cooking dinner for the family. (她正在为家人做晚餐。)
She is preparing a meal for the party. (她正在准备聚会的食物。)

"Cook" 和 "prepare" 都来自拉丁语，"cook" 来自拉丁语单词 "coquere"，意思是烹饪或煮；"prepare" 来自拉丁语单词 "prepārāre"，意思是准备或预备。