Embedded questions are questions within another statement or question. They function as noun clauses and as such should generally follow statement, not question, order.

What time is it? I know what time is it. I know what time it is. Where did she go? I don’t know where did she go. I don’t know where she went. What does he do for a living? I wonder what does he do. I wonder what he does. Who is she? Can you tell me who is she? Can you tell me who she is?

(question order) (Incorrect) (Statement order: S+ V) (Question) (Incorrect) (Correct) (Question) (Incorrect) (Correct) (Question) (Incorrect) (Correct)

When using adjectives as complements, it is okay to use question order for embedded questions:

Who’s hungry? I wonder who is hungry.

(Question) (Okay)

In some cases, depending on the focus of the sentence, question order may be used:

Who is the doctor?
I know who the doctor is.

Who is a doctor?
I know who is a doctor (and who is not).