Yeah, if you don’t know what to do just try anything that might work, including garlic and DE. For your question about yogurt, I never really gave it to sick hens. I kind of treat it like bread, and only give greek yogurt occasionally as a treat for them. Also, you should give Hattie and Scarlett oregano or probiotics. Oregano is a natural antibiotic for flocks, it boosts immunity and prevents lots of illnesses in poultry. Probiotics is known for making hens eggs bigger, so it might start up your hens system again. And if you do find bugs in Scarlett, give her iron rich foods as some external bugs are bloodsucking. Some iron rich foods that are safe for poultry include spinach and pumpkin seeds.