You need to see how deep the maggots are in her. You may need to use a syringe with diluted betadine to get the deeper ones (basically debriding). Trim those feathers around her vent and keep the area dry (blow dryer on low)except for the vetrycin wound care you are using. Vitamins and...
Welcome. This is a good product at a good price. https://www.walmart.com/ip/Mt-Capra-Goat-Whey-Protein-Unsweetened-1-Pound-453-g/114114007. You could also train the goat with treats.
Are you feeding them medicated feed? The flowers from the chives is fine. It could be coccidiosis. If you are not using medicated feed, I would treat with Corid. Treat all of the chickens.