Welcome to HCM.
I think the problem is not with the child but with you. The child does not agree with your idea of feeding. Force feeding a child is going to have an effect directly opposite to the one you intend. Never ever force a child to eat. You can fix the time for eating and if the child is willing to eat during that time fine otherwise the child has to wait till next feeding time and will not be served anything in between. If you follow this regimen for a few days you will be wonder struck to see your child attending the regular food time even without invitation. First few days you may have to face a few moments of anxiety
, but the effect is going to be everlasting for the child. The child will soon learn the hard way to respect food and from then on you will rather have to limit her eating than forcing her to eat.
Your worries about malnutrition
Wishing your child best of every thing.