Diarrhea since Friday night

Al

My almost 2 year old has been pooping Everytime she farts day and night she’s still breastfed hasn’t been drinking it as often and she doesn’t drink any other kind of milk she hasn’t eaten anything new . Her poop went from dark brown in color to a light brownish yellow color and now it’s the color of peas and watery it had a lot of mucus Friday night / Saturday morning but not anymore . I have no idea what could be causing this . She doesn’t have a fever or anything . Anyone have any idea ? Her dr office is closed till Monday