Thanks for your query.
Weight of a child normally doubles its birth weight
by 5months of age and triples by 1year of age.
There is nothing to worry as she is active and attaining milestines as per age.
You have to be very patient with these kids.simetimes it is really hard to feed them.
I suggest you to feed her while other family members are having food.
Use two spoon method that is one spoon to yourself and one to her.
Slowly she will start eating.
Hope this helps.