It sounds like they are following the protocol in the paper from UGA. It’s here, you need to create an account to read it. https://www.cliniciansbrief.com/article/persistent-or-suspected-resistant-hookworm-infections
According to what I remember reading, if they did an actual count of eggs/worms before and after the Moxidectin and there was no change you are dealing with resistant worms (opposed to larval leak which we assume Wiki has because she’ll test antigen positive but there no eggs in her stool) and Profender is the only course of action.
For me personally, it sounded a little scary due to the very small sample size, possible side effects, and the complicated math to calculate the dosage. My vet & I were both glad we didn’t have to go down that path. But, if that’s the only option what are you going to do?
Is Doolin symptomatic? Still having squeaky belly and bad poops?