Return not received. Ebay makes her refund.

[brandland]

Buyer opened return and I accept it and sent her return label. In couple days I got message from Ebay item returned and in 10 min got message she asked an Ebay for help and they made her the full refund. (Really??? I wasn't even at home at that minute as well as Ebay should give me 3 days to make a refund). When I came back home I noticed item is not delivered. When I checked the label I sent her it have never been used. I called to Ebay and guy told me it was sent with another label that have another address not even my state) they clearly see she never used prepaid return label I sent her with my address. I opened appeal and Ebay declined it. So she sent it to her friend or somewhere else, never used my return label and I should pay for this??? What about seller protection? I am shocked!!!