Ay nako, diarrhea sa ganyan kaganda is really worrying! You need to see the doctor ASAP talaga, especially sa ganitong age kasi mabilis ma-dehydrate ang babies, check if she has a fever or kung paano ang activity level niya, and if the poop is watery or may dugo. One of my mum friends' toddler had it last month at ang doctor lang nakaalam kung ano talaga ang cause, basta importante na hydrated siya with lots of water at breastmilk or electrolytes kung kaya. Hang in there, mommy!