Can she sue me for this? (ebay, mercari stuff)?

I've sold an expensive coat $1200 on an app called mercari, it's similar to ebay but you have 3 days to examine the item and decide if you want to return it if it is not as described. In the process of doing so you need to give them pictures of evidence of how it's not as described. This item is 100% authentic. In this app, you contact mercari and submit a return request, they give you a return label and when it shows that it's delivered to me they give her her money back.

The day after it was delivered she personally messaged me saying that she wants to return it because of a tiny flaw that i overlooked. I told her to do so, assuming she submitted a request and all of that. she asked me for my address and name which I thought was weird cause that would all be in the label mercari gives you. I didn't hear from her for 4 days nor did I get a notification from mercari that she submitted a return request, she didn't give me a tracking number or anything. So I asked mercari to release my funds and they did, as it's their policy to release funds if I don't hear from the buyer or if they didn't submit a return request.

So now I have my funds and the jacket arrived today, so she DID actually return it. I am not sure if I'm obligated to give her money back though, I would very prefer to send back the jacket.
I;m thinking about sending back the jacket. Could she sue me for this?
Can she sue me for this? (ebay, mercari stuff)?
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