What are your thoughts on..

Kids and eating all their dinner? I'm asking because tonight my 6 year old daughter would not eat her dinner. Before dinner she kept asking for snacks saying she was so hungry but as soon as I put dinner in front of her she took maybe 3 bites. She sat there for 3 hours. So she is getting that for breakfast tomorrow morning. And if she eats all that she can have cereal, pankcakes.. whatever she chooses. But my sister though thinks I'm so mean because I am doing this. What are your thoughts?