Good Lunch box food for kindy.?

I have just started my 3yr old at kindy and am really worried about the amount she eats. She is a fussy eater as it is so I send her for morning tea a yoghurt and a rice bubble snack, and for lunch I sent a cheese sandwich and a banana. At home she will eat a cheese sandwich but would not touch it at kindy. Her extent of eating fruit is a bite of banana. She ate it all when she was a baby. But now when I want her to try different things she acts up. I am having so much trouble getting her to eat other stuff. She likes and eats macaroni cheese, yoghurt, cheese snax, bread with limited things on it, hot chips is her extent of vegies. A bite of banana is her extent of fruit. She will eat cheerios. She eats cereal. I am DESPERATE for some more kindy lunch ideas. The kindy ladies don't want her having the cheese snack or the rice bubble snack. Can anyone help please.