Help Please- my chick is 8 weeks old

Within the last few days she got this mottled look to her- is she just growing new feathers or is something wrong with her? She was on the medicated food and I just switched her to growing up food. We live in Miami. Thank you for any advice. She's the sweetest girl.
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She is the only one so nobody's pecking her- yes, she is eating and drinking normally. I checked for mites but I can't see a thing, I am so worried- thank you for your response.

 

Uh oh I was really hoping she was a she! But I'd just be happy to know that there isn't anything wrong with her. Thank you - I will continue to watch her and inspect her area. I didn't detect any type of mites or bugs when I inspected it today. Thanks again.

 

First of all- thank you so much. I realize it could be a few different things so to cover all bases, I cleaned out her area reallly well and then bought some 5% sevin dust, sprinkled it down and rebuilt her area with hay. She has never stopped acting normal- it's just the feathers. I also put the electrolyte/vitamin powder in her water and switched her back to the medicated food- I had changed to the flock raiser food about a week ago but the woman at the feed store told me I could leave her on medicated until she was 12 weeks old. I am hoping one of these things helps her. I also still hope she's a she. I will update if anything new happens. Thank you again- this community is such a life saver and nerve calmer.javascript:insert_text('',%20'');