Is this considered child abuse?

i have two daughters which are 5 and 3. My oldest always have problems when it comes to eating, She would take one bite of her dinner and say she is full, but when it comes to juice, chips, or fruit she can gobble that down. i usually force her to eat half of her food, and if she does not i would send her to bed. My 3 year old is the total opposite she would eat all her food and would want to eat her sisters food as well. Is this considered child abuse because im forcing my daughter to eat when i know she has not ate much through out the day?