Buyer wants to return an item

[flowerpot9552]

My buyer has bought a pair of Nike trainers from me (used good condition) and she is asking for a refund saying that they are fake, which they are not.  I have provided details of where I bought them and told her to go into a Nike shop for confirmation that these are genuine.  She has opened a case against me and asked for a refund.  I do not feel that the refund is justified as they are genuine Nike.  She has 14 feedback, I have 557 100% feedback. Surely this must account for something.  She has obviously decided that she doesnt like them and is using this as an excuse to return them and I will be out of pocket with postage both ways. She paid £4.99 and quite frankly Im fed up with ebay who tend to rule in the buyers favour all the time.  If ebay rule in her favour can I appeal the decision and if so how?