I just PM'ed her
Someone else said Isoflurane gas is the gas used at their vet clinic.
The vet I went to is indeed young and new. But she specialized in exotics, and is very caring, friendly, and 'workable'. She's open to ideas and learning and isn't afraid to admit when she doesn't know and needs to research more.
It was a difficult decision to use her... the other vet I was using is experienced and knowledgeable and recommended. Has lots of hedgehog experience, including surgeries. But she didn't have the best 'bedside manners', used some outdated information and wasn't open to new recommendations, was difficult to get appointments with, and twice as expensive.