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@major-d-clutter wrote:

Ebay are telling me to send her a shipping label, This was dealt with through GSP so I don't see how I can provide an US buyer with a shipping label. 

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Ask the buyer for her address; you can then get the cost of a shipping label. For example, you could try UPS here. You can then either purchase the label yourself or send the funds so the buyer can purchase it. Either way I would suggest you take a screenshot of the page showing the cost of the label in case you need it later.

Ideally you want to purchase the label yourself so you can declare the value and indicate it is a "return of goods" on the customs form.