Seller Wont Unpair Apple Watch

So I bought an Apple Watch from someone on OfferUp and I assumed the reset process would be easy. Just factory reset it and all is well, I did not know that it's a whole unpairing process and the seller did not know that either. I looked it up and I found the step-by-step process on how she can go about it through iCloud. I have the messages, I went to go pick it up, and I followed the factory reset process step by step but her apple Id was still tied to it, that's when the problems started. I asked if she can help, but it seems like she doesn't want to help me out with the process. Where does that put me in the situation? Do I just take the loss and throw away a "dead" apple watch or is there something apple can do for me?? Thanks :(