I have been trying to see where you can look up a seller's "sold" items like you suggested, but cannot seem to see where they are listed. Can you tell me where abouts the sold items show please?

Thank you, I have found her purchase, so I will be able to let her know where she needs to return it to  🙂

Thanks for your help  

Thanks also cadam2010, your information is also a great help, thanks for taking the time to help me out, much appreciated 

I processed her refund for my item, less the cost of postage to return her other item and sent her a message with the seller's name that she bought it from and she sent back a "thank you and sorry for inconvenience", so sounds not to upset with the whole issue.
Fingers crossed for no negative feedback.  Once again thanks for your help 😄