Welcome to Backyard chickens grahamland6753!! I hope you enjoy it and the camaraderie here and everybody that goes nuts over chickens (me being one of them....) Have fun! And ask questions! I would not take her to the vet just yet, vets are not very willing to look at chickens and you will end up with money spent and no help. Sevin was probably not the best of ideas, I would try Diatomaceous Earth next time.