How to print label on item I didn't buy?

[efay4448]

The seller sent wrong item followed by correct item.  I was charged correctly and I have the item I bought PLUS the wrong item.  She asked that I return the wrong item and she'd reimburse my PayPal account for the shipping cost.  I asked that she send me a return label and I would.  After several days, she said she cann't find out how to do that and that I could keep the item (piece of needlepoint).  I told her I don't need/want it and would find a way to return it to her and she could reimburse my PayPal account.  I am confident she will reimburse me and I don't mind doing the work, but all info on eBay references a particular item I bought, which this is not.  Totally different, but from same seller.  Surely this has happened before!  I must be overlooking the instruction page for this scenario.  

Appreciate any help.  Thanks!