Flagyl is an appetite stimulant which is why it's commonly given to WC imports. Not only does it treat for parasites but it encourages stressed snakes to eat.
Hopefully it's just a resurgence of the hookworms. I've not had to deal with worming snakes, but with my horses I had to worm constantly and rotate through different types of wormers because parasites would become resistant if you just used one. So, if this snake was dosed with flagyl when it was imported, and some of the worms survived, then your vet dosed with flagyl again, and now it still has some hookworms, it might be worthwhile to switch to a different wormer.
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