Thanks for responding everyone! It is much appreciated. I sent a message to the guest, and offered a % refund, which she immediately accepted. I haven't heard back from her, and I haven't rec'd any review from this guest. She essentially vanished.
In addition, I immediately had our pest control service come to the house and set up traps. He advised, he saw little to no evidence of any intruder, so what hoping that is was a lone trouble maker.
However, at additional review of the photo that the guest provided, I am under the impression that this might be a case of a photoshop job.
Has anyone ever experienced a mouse in the same room as you, perched up and not moving , allowing you to take a picture of it, within a 5-6 foot distance?? Also, she said that the mouse had chewed the basket all up- but when my housekeeper went in and checked the area, she found zero evidence and nothing chewed.
Just trying to give everyone a heads up that this might be a new tactic.
I am by no means attempting to shirk responsibility or deny the possibility, as the potential for a mouse in the country in a farmhouse at anytime especially when the temps start to drop is highly likely.