If you have sold your item to her, what's wrong if she's using the same pictures to resell it ?
I'm a professional ebay seller, i sell different stuff. For example i sell iphone cases, brand new etc... if a seller steal my pictures to list the same item i will report to ebay. But i also sell second hands luxury bags, but as there is only one piece exactly like this, it's not a problem if the buyer buy from me and use the pictures again if he wants to list again the bag. I got the money from him so i can give him my pictures too as i won't use them anymore )) that's just my way of thinking.
sorry for my bad english ((
What's wrong is that the buyers are not buying the rights to use someone else's photos, description, or other form of intellectual property, they are only buying the item in the listing. It is a violation of ebay policy (http://pages.ebay.com/help/policies/image-text.html). If it's okay with the original seller, that's one thing, but if the original seller does not authorize it, it's wrong.
Personally, as a seller, I know how much time and effort goes into my photos. If someone else uses them without permission, it's frustrating, knowing they didn't put in the work to produce that image... If they want to sell something, either take the time and make the effort to ask to use my photos or put in the time and effort themselves to take new photos.
Not to mention, the condition of the item could change between the time the photo was taken and when the new owner lists it for sale. Even if it's a minor rub mark that occurred during shipping, it now means they are misrepresenting the item they have for sale.