Loss of appetite in children is very common and often temporary, usually linked to minor issues like a growth lull or a recent mild illness. While appetite stimulants like Cyproheptadine syrup exist, they require strict medical supervision due to side effects like drowsiness. Safer, supportive options include syrups containing B-vitamins and Lysine, which naturally help support metabolism and appetite. However, I highly recommend consulting your pediatrician before starting any medication to ensure it is safe and appropriate for her. In the meantime, try offering small, frequent portions of nutrient-rich foods without forcing her to eat, to keep mealtime stress-free.