Crazy Buyer left bad review

I sold some Birkenstock clogs to this buyer who was upset that UPS did not update her item. I told her UPS does not update a lot and to wait until the expected arrival date. I knew that if it was for sure lost, Mercari would make me wait a few more days until I could actually report it and we could get actually get a refund. Against my wishes, she filed a claim. UPS found it and it was on her way to her house. It arrived today and she gave me 1 star. I was looking at her profile and this isn’t the first time she has done this to sellers :/