I believe you can get Piperazine 52 in Canada for large animals and that can be used in chickens to treat roundworm. I am not sure of the dosage though.
She looks very sick from the picture. Her tail is down and that could be a reproductive issue, infection, or internal laying. Coccidiosis could also be a problem, with her puffed up appearance, sleepiness, and weakness. Amprollium from a vet treats that. What do her poops look like? With these symptoms, just about anything could be wrong. Does she have problems walking or with balance? Has she been acting like this since her injury?
She looks very sick from the picture. Her tail is down and that could be a reproductive issue, infection, or internal laying. Coccidiosis could also be a problem, with her puffed up appearance, sleepiness, and weakness. Amprollium from a vet treats that. What do her poops look like? With these symptoms, just about anything could be wrong. Does she have problems walking or with balance? Has she been acting like this since her injury?