Was it the French Doors? If so, she is bidding on a LOT of items at the moment, so this might be something she does when she realises she has overspent. Ignore it and it will go away kind of thing.

I hope someone corrects me if I'm wrong, but I think if she doesn't accept or decline the cancellation in 7 days, eBay closes it and you get your fees back. If she declines it, I think you lose your fees.

Just hope she doesn't neg you for your efforts because your poor old feedback and DSR's have taken quite a battering by the looks of it. Another one could see you lose your selling privileges. (not having a go at you, was just an observation, they were clearly a difficult buyer)

Good luck, I hope it all works out for you.