The correct active/passive form of the given sentence is She asked me why I had not searched for a job.

The sentence is in the simple past tense, which is used to describe an action that happened in the past. The active voice of the sentence is formed by putting the subject of the sentence before the verb and removing the word "by." In this case, the subject of the sentence is "she" and the verb is "ask." So, the active form of the sentence is "She asked me why I had not searched for a job."

The other options are incorrect because:

• She said to me, “Why don’t you search for a job.” This is the original sentence in the active voice.
• She asked me why did I not search for a job.” This is the incorrect form of the verb "do." The correct form is "did."
• She asked me why I did not search for a job.” This is the correct active voice form of the sentence.
• She asked me why you did not search for a job.” This is incorrect because the pronoun "you" is not referring to the person who is speaking.