I would imagine human vaginal thrush medication will work. I know some people use that for sour crop, so it is safe to use on chickens. It may also be beneficial to start using Raw Apple Cider Vinegar in the water or I believe Acidified Copper Sulphate, but please do some research to confirm...
The commonest cause of Ascites is internal laying, but since she is still laying eggs then we can probably rule that out. Fatty liver Haemorrhagic Syndrome is another common cause. Which is linked to dietary imbalance (too much carbohydrates and not enough protein) but can also be genetic and is...
You have been given good advice above. I would also suggest that you trim her butt feathers to prevent re-soiling and so that you can easily monitor the state of her vent and wipe and reapply ointment more easily when necessary. It might be worth checking her for any abdominal swelling. Often...