Ay, ganyan talaga with viral infections, kahit na-clear na ang lungs, ang ubo sometimes tumatagal pa ng ilang linggo kaya don't worry too much! Since the labs came back normal and she's on treatment na, best thing is to follow up with your pedia ulit if the cough doesn't improve in another week or two, or kung may bagong symptoms na lumabas, para ma-rule out kung may ibang nangyayari pa. In the meantime, hydration and rest lang talaga ang makakatulong, plus maybe honey if she's old enough, pero your doctor will give you the best advice on what else to do based sa condition niya.