Two thigs abot this strike me as odd.
1) McDonalds serves pork sausage, and Canadian Bacon, and regular Bacon
2) McDonald’s issues uniforms. The key is the uniform, meaning “presenting an unvaried appearance of surface, pattern, or color”.
Since the Hijab is not part of the uniform they must remove it if they want the job. It is the same as some brother coming in wearing a dashiki and a fez. Since Michigan is an “at will” state, either don the uniform or work someplace else.