Unfortunately ebay will almost alway side with the buyer, even when the buyer is clearly in the wrong and ebay know it

I understand you have already wasted time on this when you should'nt have to, but I'm just wondering if you have spoken to a supervisor ? Ground level CS staff in the call center rarely care (sometime people are lucky enough to get someone who is excellent)

Too many sellers have closed their account due to scammers,fibbers and their mates who support them

You have no returns on your listing, you have messages from the buyer saying 'it does'nt suit' as the reason = buyer's remorse

One wonders if this is the first time she has pulled the same stunt

Times before a buyer has said such and such was not as described,or damaged or wrong size and have been busted posting photos of themselves on Facebook in said clothes

Might be worth hanging in just a little longer if you can, too many good sellers are gone because of rotten apple buyers