Hello dear... I have gone through your post in which you have mentioned that your daughter has had bright green diarrhea
accompanied with stomach pain for two days.
All these symptoms indicate that she may be having Gastroenteritis
Mostly it is viral in nature & can be managed by maintaining adequate hydration in the form of Oral Rehydration Solution (ORS)
But if they are associated with fever, vomiting & blood tinged stool, then bacterial cause is suspected & treated with antibiotics (Metronidazole
If symptoms still persist then it will be better to consult a Gastroenterologist
Also make sure your daughter is eating a healthy diet.
Avoid junk foods & also have a look if she is allergic to any particular food product.
I wish her a good health & speedy recovery.
Thanks & Take care.