Hard to know if she needs deworming.Would you recommend a deworming just in case? Is ivermectin a good choice?
I'd check to make sure her crop is emptying.
If you feel she does or you can take a sample of her poop for testing, then use Safeguard or Valbazen to deworm.
To treat most worms that poultry can have except for Tapeworm you can use Safeguard (Fenbendazole) or Valbazen (Albendazole). Both are given orally by weight; they do not mix well with water.
Safeguard dose is 0.23ml per pound of weight given orally once a day for 5 days in a row.
---OR---
Valbazen dose is 0.08ml per pound of weight given orally once, then repeated in 10 days
Here's how to give oral medications:
https://www.backyardchickens.com/ar...dications-to-all-poultry-and-waterfowl.73335/