You have done pretty well all you can to end the transaction quickly and amicably.
The seller may now send you a Mutual Cancellation request.
Agree to it immediately.
The transaction ends. Your seller gets her selling fees (which may be upwards of 20% of your payment, had you made one) back. Both of you can leave feedback.
Since the seller saved you from a UID Strike, feedback like.'Thank you for your help.' and five star Ratings at least for communication would seem merited.
Or.
The seller can open an Unpaid Item Dispute.
If you do not pay that promptly, the seller gets her fees back, neither of you can leave feedback, and you get a UID Strike, which will make it harder to bid or buy on eBay in future. Many if not most sellers have automatic Blocks against bidders with Strikes.
