I purchased a 3-week-old Cream Legbar pullet from a breeder, yesterday afternoon. Once I got her home, I noticed her breathing seemed to be a little labored, and she acted like she didn't want to move much. She responds to touch and becomes vocal when I pick her up. I gave her some feed and water with electrolytes and probiotics. She is chirping contently and her eating and drinking seems normal. She is not gasping for air and is pooping normally. How long should I wait, to know for sure that she is not sick, to introduce her to my 7 2-week-old chicks, who are at least twice her size?