Is She Healthy?

[AbbysSilkies]

Hello!
I have been asked to adopt a red frizzle hen!! I am very excited. But does anyone know what causes stunted growth? She’s doing fine aside from size, but I want to make sure she won’t pass on any disease to my other chicksns

 

[Chicken-lovebirdchihuahua]

Sometimes I just get runt chickens they are all healthy