Thanks for the chance to help. I am an attorney with over 12 years experience. Hopefully I can help you with your legal question.
Your wife certainly has the right to demand that the unlicensed images be removed. She has this right under the DMCA (since she is the subject of the photos, since she is not a celebrity, and since she did not consent to the use of the photos, she can demand they be removed).
A DMCA takedown notice can be sent by a copyright holder to a website host or even Google or Yahoo to have a picture or photograph removed or de-indexed from the web.
Now...if the goal is to find the culprit? The person who posted this? That is possible...but may take some work. If you know where the picture was posted, it is possible to obtain the "server logs" (the information that shows the address of the computer used to upload the pictures). Once you have that information, it may be you can determine who made the post. For example, if the files were uploaded from an internet address associated with a particular person (like a cell phone account or a residential internet account) that may be enough to seek prosecution, or at least seek civil damages (for invasion of privacy).
To get this information, you would need to file a lawsuit. You can file the lawsuit against an unnamed person...this allows you to go into the "discovery" phase of the trial...then you have access to the court's subpoena
power and can file a subpoena for the server logs. Once you have that information, you can amend your lawsuit to name the person who posted the information online (assuming that the server logs give you enough information to name the person who did this)
BotXXXXX XXXXXne: you can demand the website remove the pictures under the DMCA and you can sue in order to determine who actually posted the pictures in the first place
Now...if your description it sounds like you are working with a website and they are not helpful. You may need to hire a lawyer. The lawyer can actually sue the website if they do not follow the rules of the DMCA. And the lawyer can properly craft the subpoena to reflect what you are looking for...you want the IP address associated with the upload of that file. Once you have that, you will need to go to the internet service provider who is responsible for that IP and issue a separate subpoena to get the name or account associated with that IP address.