I have a child like this too. I have tried everything (child is 2.5yrs old) I sent away from table, I put a small portion, made the foods they like, made the foods mom said child like. I tried it all. AND I HAD ENOUGH OF IT! I know people say to pick and choose battles, but when I cook it, I expect you to eat it. And guess what, child now has to sit and eat, it takes an hour but child will eat.
Last week, child ate no breaky for me, wanted crackers, didn't give any, didn't like snack either. So had to wait for lunch. Sat for an hour but ate the lunch. But went home and didn't like the dinner, so child went to bed without eating nothing all day except for lunch. Guess what, next day became ill with fever and was tired.
I've tried to get parents on board but its easier to send to bed then to deal with it.