Buyer wanting refund for what I think is buyers remorse

I sold a dress last weekend, brand new with the tags still on.

It was tagged in 3 different places and had just been tried on once in store. It was bought for a wedding and never worn as it was a wedding abroad and saw something I liked a lot better about 4 weeks afterwards so having had it in my wardrobe for about 4 months I decided to sell. I bought it for £89.99 and sold it for 6.99 but I know that's irrelevant.

I took loads of photos and did a complete description. The buyer has received the dress but says she is not happy with the condition, it is clearly not new and it has rubbed patches from being worn.

The thing is that it is a dress which has a lining and then a velvet look layer with appliqued flowers and surrounding each of the flowers is a patch that looks a bit fluffy (for want of a better description) but that's the design of the dress. When I listed the dress I explained that it was difficult to describe but took 12 photos including close ups to show it properly.

I genuinely think that she does simply not like the dress, I know for certain there was no sign of wear because firstly it has not been worn and secondly, I double check every item I sell before listing and again before packing.

I assume Im going to have to bite the bullet and refund in full and pay the return postage as she will only open a case if not but its so maddening. Her photos showing the ' wear and damage' show nothing different to the photos I took as its neither wear nor damage.