Hi
This is my best plan as it gets in the greens without a fuss:
Take chopped onion, finely chopped fennel, defrosted and drained spinach nuggets (start with about 4 per 500g minced meat, build up to double that.) Blendthem all together with an egg until the mixture is frothy and then stir it into minced meat to make burgers. Add wholemeal breadcrumbs if the mix is too soft, then form into burgers, grill, stick in a burger bun with a small handful of chips on the side and a serving of corn or beans, and they have no idea they've eaten two of their five a day.
I also use a similar mix of veg to the ones you use in your Bolognese, reduce the sauce until it's very thick, and blend it into a very fine puree then spread it quite thickly onto pizza base and top with mozzarella or cheddar. That gets onions, peppers, courgettes, mushrooms, tomatoes into them.
If you mince leek, celeriac, parsnip, mushroom and butternut squash, cook very gently until soft and add them to the meat when making shepherd's pie, they become almost invisible. Not ideal if she doesn't eat potato, but if she likes pastry you could put the mix inside a homemade pie or pasty.
For my fussy eater I introduced tiny amounts of new things into food he already liked, or put together things he liked then added new things to the mix. So you could make a cowboy casserole of baked beans and sausages or bacon. If she eats that, add some onion and finely chopped red pepper and mushroom next time.
Make a milkshake of milk, a banana, some strawberries and a bit of sugar or honey and vanilla essence.
Bake banana bread? Or apple and cinnamon muffins? Or raspberry and white chocolate. For a while I got away with chopping dried fruit, such as mango and apricot onto ice cream and pretending they were chewy sweets.