1.实际上,你可以直接就和她说: Good morning/afternoon,微笑着打个招呼,不用刻意的称呼她。
2.如果你真的就想称呼女考官的话,I think Ms. for the young and Madam for the elder is good.
You could just say Good morning/afternoon.
If you really want to know, I think Ms. for the young and Madam for the elder is good.