That's definitely a big enough drop that with that and your description of her body condition that it sounds like nutrient supplementation is probably in order. Glad you're stopping by to talk to your vet about it so soon! Poor little girl is very lucky.
Plus side if your vet does decide to go the tube feeding route, snakes' glottis is super obvious and separate so basically no chance of putting it down the wrong hole. It might even be easier than baby raccoons & opossums which are super easy to tube (bunnies on the other hand are terrible and I don't do them). Probably easy enough to learn in one session without much problem.