Hi, welcome to BYC!
Sorry your hen isn't well.
How old is she? What do you feed including treats and supplement? WHY did you worm? what did you worm with? Did you do the antibiotics at the same time? Why antibiotics? what kind? How many other birds in how much space? How has your weather been?
Wormer meds are poison and can really make a bird feel like crud. If they are already ill and wormed without verification of species or load.. being their problem... it could push them over the edge. And worse maybe not treat the type of worm they have. Wormer and antibiotics can BOTH cause diarrhea in my experience...
I would start by hooking her up with some scrambled egg which is loaded with vitamins, minerals, and protein... that are easy to digest.
All questions are just to help get clues. Other statements are for informational purposes. But I know we are all here to learn, so don't let them come off as judgey please.
Can you post a pic?