Hello, yes certain children do not eat well n are a little fussy at times especially with regard to food. Have you got her dewormed in the recent past?
Next Steps
Other than junk food, give her whatever she likes. Add certain dry fruits to her regular meals. Take her for small walks along with you.
Health Tips
Engage her in outdoor activities as per her liking like swimming, cycling, basketball etc. Please do consult here for further details.