Can she cancel the purchase? What should I do?

Questioner

I sold a horse trailer from 1999 on October 2, 2020. The buyer took it for a test drive and looked underneath with a selfie stick. They picked it up on Sunday, October 4. Now she calls me on December 29 and tells me that the trailer has all kinds of defects, which a garage has discovered. She wants to cancel the purchase. Unfortunately, I cannot find the advertisement on Marktplaats because I removed it after the sale. After some app back and forth. I indicated that I would not take the trailer back because she has had it for almost 3 months. The last app contact was on January 5. So I didn't hear anything for a while until I received a registered letter today. Now I also want to know what my rights are. She indicates that the brakes are not good, edges along the bottom and even the chassis are bent. I am very surprised about this and especially that she comes after almost 3 months. I would like to hear your opinion on this. Kind regards

Lawyer

Firstly, whoever thinks he has a right to claim something must also prove it and not you. Secondly, the right to complain is. The rules of consumer law are used (two months' notice for each emerging defect). Finally, the buyer has a duty to investigate in advance. Has the buyer already written to you? I can help you with this problem.