Vegan cooking is no more of a faff than any other cooking. You're just swapping one ingredient for another.
If you're making a curry use a can of chickpeas and frozen spinach rather than chicken.
Make a chilli with peppers, courgette and kidney beans. Using soya mince isn't necessary.
Bolognese or shepherd's pie substitute cooked lentils instead of minced beef.
For lasagne, as above but use vegan margarine and soya milk for the white sauce.
If the family are having beef or lamb stew you can use a similar base but add cannelloni beans instead of the beef.
For a roast meal roast the potatoes separately in oil and do vegan sausages too.
If the worst comes to the worst a baked potato with baked beans and veg or salad is a good simple meal.
Of course there are faffy vegan meals in the same way that there are faffy meat meals. Just choose the simple ones!
In terms of expense all of the above are cheaper than the meat equivalent. The cost only rises if you use fake meat products.
If your DD is happy to eat differently rather than eat meat substitutes then you should cut your weekly food bill.