New and clueless. Beautiful silkie with a rank butt
For being new at this you are certainly doing many things right. Here are some more ideas. Good luck
bathe the chicken to help cleanse and soothe the affected area.
-Nystatin liquid suspension provided by the vet to be given orally is very effective for 7-10 days. It is also available online
-Anti-fungal creams like those used for athlete's feet applied topically twice daily to the vent area for 14 days.
-Garlic cloves, 1 per gallon, added to their water supply can be helpful as well.
-During treatment, avoid feeding your chickens foods that have a high water content and can cause watery stools, such watermelon.
is she laying eggs still, could she be egg bound? maybe an egg is stuck and pushing the vent out and preventing her from pooping well. Soaking her in a warm bath will help it will relax the muscles or /and put some vaseline/lube in her vent to help move the egg. She will have a hard abdomen if there is an egg stuck.