In first query she had said husband has destroyed evidence and want to file harassment case! now she says she wants to stay with husband and doesnt want divorce! Both are contradictory.
How one can destroy evidence? As mentioned they had 3 rounds of discussions, if they know for sure that they are asking money and harassing the girl, definitely they would have recorded the conversation. If the person is smart enough to come to the forum and ask for advice - meaning she would have taken precaution to record the conversation atleast one time because she has made up her mind to put the harassement case as per the first query!
Fighting back, your answer is right I guess.
If this is really true, you can easily get evidence. If you say you cannot, then it is not true! But dont worry nowadays women are filing all false cases against husband/inlaws if their demands are not met!!