I would mix them into the eggs. Her vent area doesn’t look excoriated as vent gleet looks, but it won’t hurt to treat her for a fungal infection. Nystatin (sold as Medistatin powder) is good for gleet and fungal infection. You could get a feeding tube and tube feed her for a few days to see if she perks up. It is hard to know if she could have gleet, kidney, heart, or liver problems. Passing a lot of urates can make her smell of ammonia. Her droppings look green like she isn’t eating. Can you get an antibiotic such as amoxicillin (FishMox) or baytril, or do you have any problems using those? Baytril (10% enrofloxacin sold online) is banned for chickens, but is sometimes used for serious infections since it treats more bacteria. It requires a month long egg withdrawal.