Not gaining weight. Well into her body.

My daughter will be 7 years old this July. She does not eat her meals properly. She does not chew her food properly. She can eat other foods like biscuits, chips , fruits, etc but she doesn't chew and swallow rice and roti which are her meals. Only for meal times she has this problem. I try to include a balanced diet for her giving ghee parathas, chicken, eggs, fruits, vegetables, nuts, lentils and pulses and plain milk. Still I can see her skin sticking to her bones with no flesh. Her weight is just 16 17 kgs at 6.5 yrs of age. Her birth weight was 3kgs. She has been lean since then but now this weight at this age is concerning me. We are not giving her pediasure or any such powders as not confident about benefits just sugary powders. Even after giving her nutritious food I feel it does not get absorbed well into her body.