Hi everyone hope you can help please with some advice for a reply .

..Between 2 ids with over 1000 positive between them I just received my first neg yesterday from a buyer with 0 feedback and who joined  ebay the day she  bought from me. I always  have in my listings and also send a note with all items saying that I will happily refund in full, apologising  if I have made a mistake, item not as described etc and to please contact me first if there is an issue as anything other than a positive will affect my ongoing selling etc . 

The buyer made no contact at all to let me know there was a problem. The dress was given to me to sell and I was told that it was new, however my mistake I  know I should have double checked before sending..it definitely looked new to me. I have sent a message this morning apologising and offered a full refund  plus I have asked if she would consider revising her feedback .Your suggestions for a reply please to the neg if I don't hear from her...thinking along the lines of  "So very sorry,no contact,genuine mistake would have refunded in full "

Many Thanks : )