If she is eating enough of the feed with the Flubenvet, that is fine, but if she isn’t you may want to give something orally to worm her. Panacur horse paste is one choice. If you are in the UK, then you can get Harkers Coxoid, which is amprollium and the same medicine as Corid. If she is having...
How old is she? Is she a bantam or a young pullet? Is she having runny droppings? I would get some Corid liquid or powder at your feed store in the cattle medicines to treat for possible coccidiosis. Dosage is 2 tsp of the liquid or (1.5 tsp of the powder) per gallon of water for 5-7 days. Also...