Need to know her weight and chart it on growth chart to know is she really underweight and need treatment or not.
At 1 year average weight is around 9 to 9.5 kg.
In children at this age usually don’t make any diet plan instead give different food items in different ways.
Next Steps
Consult pediatrician online or in person.
Health Tips
Make meal time family time and fun time. Then child will take meal happily.