Hello..... If she has having diarrhea now you must consult doctor... If stool is  green and frothy like algae, she's probably getting too much foremilk the (low-calorie milk )that comes first in a feeding and not enough hindmilk, the good higher-fat stuff. It could mean that her mother is not feeding her long enough on each breast.if Child has watery diarrhea then consult pediatrician.