Thank you so much. How do you do the warm baths?
I have a dedicated rubber dish pan that I use for my chicken. Run in some warm water, add your epsom salts (follow package directions), swish to dissolve. Place the chick gently in the water - try to get the water deep enough to cover her bum - stay with her at all times - soak around 15mins or so - whatever she will take - some chickens love a soaking, others not so much. Dry well before going back outside - depending on your night time temps, you may need to use a hair dryer on low to dry the feathers.
Alternatively, you can soak rags/wash cloths in warm epsom salt water and apply them as compresses, changing out your rags for fresh warm ones.
Keep us posted.