I have a very very picky nearly 5 yr old (next week) and she has sensory issues as well, so textures can be a worry.

I got inspired from reading Jerry Seinfelds wife's book "Deceptively Delicious" and the Australian one that is similar "Cauliflower Conspiracy". And after 18 months of doing food this way, my daughter has added more foods to her list of foods that she will eat.

So.... some things that may help is the way you deliver the food. Meat balls might not get eaten on their own, but on sticks (toothpicks) they may be eaten more readily.

When I make anything, ANYTHING I add pureed veges in there. So, meatballs may have 1/2 cup of pureed broccoli in them as well as everything else. Spag bolognaise has a carrot, a zucchini and 1/2 sweet potato with tomato puree as the sauce with garlic, salt, pepper, and basil.

Soup. Matilda loves soup! Once a week we have pumpkin soup, or potato leak & bacon soup (with hidden cauliflower!) all the soups she will eat have to be pureed, but that way I can hide heaps in there.

Quiche... frittata... great ways to hide veges and encourage some eating of ham or bacon.

Anything on a stick! Matilda loves it. So we make chicken kebab sticks, shish kebabs (lamb mince) or something like that.

Don't worry too much, get to know her tastes and tweak it a bit. If she loves pasta bake, play with it, make it once a week and then make a risotto bake as well that week. Stir frys, fried rice etc etc...

My kids rarely eat meat & 3 veg, but then again, its not something I cook very much of because I don't like it myself too much.

Goodluck!