The ASGV was formerly a fictitious organization, which consisted of one vet who was on the PPP payroll.
However, since money talks, they have systematically been convincing more and more vets to join their organization, so now it actually appears to be a legitimate deal.
Of course, the only vets they will convince to join are those who do see exotic animals, but are unfamiliar with sugar gliders specifically. Therefore, those vets wouldn't be a good choice for a glider vet anyway! If they have a general knowledge of sugar gliders, and then "honed" their information at the ASGV website, I'd steer clear.
However, if you like the vet, and feel she can be "saved" ... encourage her to go to this site:
http://www.sugarglidervetinfo.com/
It is a website FOR vets, and was designed and developed to both educate vets, and counteract that ASGV nonsense.
Good luck!