"who is she ?"和"what is she" 分别在什么情景下使用？

WHO IS SHE？她是谁？----SHE IS 加（人物的最显著特性，如名字[LUCY]，身份[MY MOTHER]，职业[A SCIENTIST]或者是从句结构。即人物的明显特征。能够说明她的身份的）

WHAT IS SHE？她是做什么的？（也就是她的工作/职业是什么）
那么像这个句子就是有规定的了。只能涉及其职业面
如SHE IS A DOCTOR直接表明了她的职业
或者SHE IS IN CHARGE OF LOOKING AFTER PATIENTS，间接表明她的职业

例子
WHO IS SHE？
SHE IS MY SISTER她是我姐姐
SHE IS A SECRETARY她是位秘书
SHE IS LUCY ZHANG 她是LUCY张

WHAT IS SHE？
SHE IS A PROFESSOR她是一位教授
SHE IS IN CHARGE OF TEACHING STUDENTS她负责教育学生（即她是位老师）

对的。]
who is she?指问她是谁。没有明确指向性。
what is she？就是问她的职业是什么。

who is she? she his girlfriend

what is she/ what does she do? she is a teacher...

who is she？她是谁
what is she？她做什么的？
你明白汉语意思了，就知道怎么用了