Ay, anak ko parang ganyan din ang nangyari sa kabit ko, ang bata niya nag-period na agad at payat talaga despite eating well, kaya kinonsulta namin kaagad ang pedia. Since your daughter started menstruating na at age 9, it's really best to check with a doctor para ma-rule out kung may hormonal or nutritional issues, kasi sometimes ang early period ay may connection sa growth at weight. In the meantime, try adding more calorie-dense foods like peanut butter, eggs, avocado, at milk, a few of us swear by giving our kids frequent small meals instead of big ones, lalo na kung mahirap kumain ang bata. But the doctor visit talaga ang importante para sa peace of mind mo!