Ok, the smell if she also has Vent Gleet will be strong smell yeasty also sticky from whitish to a yellow. Hinney may look wet from clumpy feathers. One of my girls who had a severe case had a swollen abdomen from gleet. When she tried to lay they were rubbery would break as she strained and would need to be cleaned up. Sometimes needing to pull out the rubbery skin from vent. Gently rinsing out vent with warm water to remove the rest of the egg.
Clean her up by a nice warm bath, and isolate till she dries completly. The gleet discharge will gum things up really quick if a bad case. Tempt her to eat yogurt with a bit of honey. You can also use honey on her vent to give some relief, as it has natural properties to act as antifungal, antibiotic. The best is a local honey that hasn't been processed like those from major companies. I put honey I use on my girls in a squeeze bottle so I can easily apply it and don't use for human consumption. ACV in water for all of them is good.
The same thing used for womens yeast infections will work, or other cream antifungal. Fermented feed can help prevent some vent problems. Feed wet with acv added to it, pickles, my girls get pickles once in awhile or the pickle juice mixed in feed.
Sorry if rambling trying to think of all things have tried for gleet, oh duh let me grab notebook....
Yogurt mixed with feed or seperate
Acv in water
Honey in yogurt
Honey to vent and inside vent
Bath to clean her up - prevent flystrike from messy bottom
Miconazole rubbed around vent and inside 2x's a day fo 5 days
Antifungal cream used for athletes foot applied to vent and inside, was successful but longer than a week to clear up
Seperated in a dog crate, in coop covered to keep dark prevent egg laying, slowed down enough to get her to heal
Tube feeding with Kaytee bird formula food when hen was losing weight from not eating on her own. Filled crop up 3-4 times a day one at bedtime to make sure had enough for overnight.
Gave vitamin B, and poultry nutridrench.
Knew there was a reason I kept the notebook. Each hen has a section to give treatments, or description of health when checked. Personality, etc.