Peer pressure is a wonderful thing even at that age! DS is 18mo and is a good eater but eating with other children has taught him a lot.
Do you eat with her or does she eat alone with you guys eating later? I notice that my son eats better and messes about less when he has his dinner with us. Plus, we give him toddler versions of wha we have, or something pretty close. For example, last night dh and I had bacon, mashed potato and cabbage - ds had the potato and cabbage but had fish fingers instead as the bacon would be too much for him. He is curious about what we eat so we let him try things from our plate to let himtaste new flavours. He also seems to like the social element of us all at the table talking about stuff, it makes it more of an occasion. Also, we have taken him from the high chair and now use a booster strapped to an ordinary chair - he uses the table like us and it makes him seem more a part of it.