Wrap her tightly in a towel to confine wings and feet. Leave a flap to bring over her eyes and hold it over her vision while you pry open her beak. Hold her snuggly against your body with your weak hand while inserting the syringe with your strong hand.
Slide the oral syringe with the measured...
It can happen that a chicken imported onto soil different from where they came from can pick up coccidia in the new location that's a different strain from the coccidia they are used to and have developed resistance against. The incubation period is about right, so this is a good possibility...