Hello everyone! I’m new to this group, so hope this is allowed. I would really appreciate some legal input on a situation I’m currently in. Apologies for the length!

Hello everyone! I’m new to this group, so hope this is allowed. I would really appreciate some legal input on a situation I’m currently in. Apologies for the length!

Back in December of 2021, I sold and shipped a used Spanish saddle(for horses) to a woman in Florida(I’m in California). I sold the saddle for $600. She paid for shipping. I had the saddle posted up on FB marketplace, and the woman and I conducted the transaction via PayPal friends and family(because I didn’t want to get charged the fee). The saddle was not in 100% perfect condition which I made sure to mention in the ad. It was a used saddle I acquired from a man who’s father bought and ended up never using it before he died. His father however had messed with the underside of the saddle, which I believed was an easy fix. I just didn’t want to invest any money in fixing it. All I did was ride in the saddle a few times and listed it up for sale. I uploaded photos of all the angles and was transparent about any faults I was aware it had. I should mention that I am also not an expert in Spanish saddles, and this was the first Spanish saddle I owned and have even seen in person. Therefore I described the faults to the best of my ability. This woman who bought the saddle from me seemed to be fine with the faults it had by looking at the photos and considering what I mentioned. She seems to be much more experienced with those type of saddles than I am. When she got the saddle, she stated she was shocked at its condition and that I did not disclose the appalling state it was actually in. I was not expecting her to be so angry about the saddle despite seeing all the photos where I made sure to show off the flaws and my description of the flaws(known to me based on whatever knowledge I have in Spanish saddles). She then stated she wanted a full refund including shipping. I told her that I did due diligence in providing all info on the saddle known to me and considered this private sale a done deal with no refunds. From there, she started to argue with me(where she began telling me different stories about taking the saddle to multiple repair shops that supposedly didn’t even want to fix the saddle at all, but also for some reason told her it would be about $1000 to fix it), and I ceased to respond to her messages. A couple days later she told me that she was fine with accepting a 50% refund including shipping(which amounts to the large sum of $405). I didn’t respond to that either, because I still considered the transaction a done deal. Now(a bit over a month later), she is looking for a lawyer to take me to court under the guise that I purposely and maliciously left out mentioning certain flaws of the saddle. That is completely untrue!
This is really stressing me out because I’m just a college student that only tried to sell a saddle to gain back some funds. I believe I’m completely innocent in this case, but she certainly does not and has it out for me. 
Please let me know if you have any additional questions.
My deepest gratitude to anyone who can give me their thoughts!