Alright all the vegans especially, how do I get my step daughter to eat more fruits and veggies.?

For all others, she won't eat meat of any kind and only eats raw carrots but no other veggies and only apples sometimes and banannas and won't even eat cantalope honey dew melons. You get the drift. She is 12 yrs old, has medical problems and she won't eat melted cheese or pizza, tacos, burgers, meatloaf, smoked sausage. Only eats chicken nuggets and fish sticks and french fries. She won't even try any new foods, says she gags if she is forced.