I wonder if this might play out with her getting a really skanky, beaten up, on-its-last-legs old one that she's got from a charity shop or jumble sale or something for £20 - without admitting that they've got a cheapo replacement.
The story might be that she was so diligent in following this up for you, because she knows how important it is to you (although she oddly didn't think about this before, which carelessness caused this whole charade in the first place) and she did go all the way back to the hotel (it actually cost £X in petrol money, so you could maybe consider being a good friend and paying/contributing to that - as it was after all a big 'favour' that they did for you).
Unfortunately, although the low-down dirty thieving chambermaid who brazenly stole it was eventually caught and sacked, she'd clearly already used it very heavily and abused it - meaning that this grubby, old, trashed, burnt-out husk of a thing IS actually the remains of your original lovely one.
Isn't it a tiny bit disappointing for you; but at least you finally did get it back, thanks to her amazing, valiant efforts and determination to help you sort your problem.
So glad it was all happily resolved in the end; hey, don't mention it and don't feel the need to thank her - what are great mates for, eh?!