Hard to say.
When I adopt chickens, I deworm them and treat them for coccidious. Just as a precaution. After they join the other chickens (I have multiple flocks), then they are treated on the same schedule as everyone else.
She may go through detox. Have runny poo, smell funky, act weird as her body adjusts to a healthier life. (She may have been on all kinds of stuff to keep her producing, from medicated feed, stuffs in the water, and artificial lights to keep growth/production going.) I've adopted chickens that were in high stress/over crowded/less than clean conditions and the person's main goal was egg production.
Her feathers may fall out - like a molt. The feathers may change colors. The beak may change colors. I've had some change eye colors too.
Just keep talking to her in a soft voice and try to keep to a schedule with her. If she came from a CAFO (personal or commercial) she's use to a routine. Go with the fermented feed or wet food for her.
I'd love to see updates/pics of Lucky.
As everyone has said, great job on taking the poor girl in! 
No telling what she has been through. I wouldn't consume the eggs, no telling what kind of history she's had. I am very happy to hear the poor little now has a wonderful home!
