I’m kind of confused. Is it bugs that she says bit an apple or is it a mouse? If it looked like human marks, I’m trying to figure out how large the bugs were. When you took the traps, did you ask to inspect your space to make sure there weren’t other bugs?
As far as review, I would touch base with guest TODAY and ask if everything is okay and if there’s anything else that you can do to make their stay is more comfortable. I hope when you took traps you stated that you had never had anything like this happen before and that you are sorry that this has occurred. Good communication is key in delicate situations like these.