Thank you for sharing your query on Healthcaremagic, I have carefully worked through your case and most of the stool changes color have a little meaning, the green stool may be due to the poop goes through the intestines to fast ( diarrhea) it has no time to turn brown, so it comes out green, but that s not a possibility because your daughter is constipated so we need to consider other causes, although she is not eating green leafy vegetables at this moment I suggest to watch for flavored drink mixes or ice pops, candy or some medicine such as iron supplements. Please kindly rate if my advise has been helpful Wishing you a good health Dr Tania Portelles-Driggs