Hi, everyone. I need some advises on this situation. 

One of my item (hairband) was recently sold on eBay auction. I originally bought this hairband for $14.95. I put it as auction starting price as $15.90. It had one bid, sold as $15.90. I sent it in an prepaid Australia Post Parcel and Tracking.

Yesterday, I received a negative feedback from this buyer who said 'Says on the tag that the item was reduced to $14.95. Outright ripping people off'

I immediately contacted her and explained to her I didn't rip her off. I hardly broke even on this sale after taking off the eBay fee and postage. I also said I do want her to have a positive shopping experience at my store and offered her to do partial refund if she could remove the negative feedback as it is important to have 100% positive rating for seller.

She responded back as 'Maybe you should say on your listing that it was on sale along with the RRP.'

She didn't mention anything about accepting the offer and removing the negative feedback.

I'm not sure what to do from now on.

I'd like to have some advises and opinions on this situation. As a seller, should I declare how much I paid for an item on the listing when I sell the item? How can I improve the listing content and service to avoid the similar situation in the future?

Also, what I should do with this buyer? Should I just move on or persuading her to considering removing the feedback?

Thank you in advance for all your help:)