I think I'm just going to let it go. Despite what the CS person told me and despite what their policies state, we all know that the instant either party asks eBay to step in, it automatically closes in the buyers favour, regardless. I'm pretty sure they time out after a month so I'll just ride it out. Given the buyers habit of ignoring things, I'd be surprised if she'll be back. One of the CS reps said they sent her a message telling her how to close the dispute, due to the tracking showing as delivered, but she's ignored that too.

I still think it's either a malicious tactic because I opened an UPI on her, OR, she's opened the dispute on the wrong seller and thinks if she ignores it, it will go away.