I second getting your daughter involved in the cooking, and any of the other kids that are interested and old enough. Kids usually like eating something they have a vested interest in.
Start now making a binder with all of your new successful recipes (I have faith there will be more!) I hate it when I make a new dish, then can't find the recipe again. Soon enough, they will become committed to memory, but in the beginning, it helps to keep them all together.
I also want to mention frozen veggies. A little water, salt & pepper, and some dehydrated onion added to a bag of frozen green beans makes a pretty good side dish -- 10-12oz bags can be found for under $1 in my area.
Also, protein snacks will keep the kids full longer than chips, crackers, etc. One of my local stores has low sugar, low carb flavored yogurt cups 10 for $4, and everyone could choose their own flavor!
Cheese sticks are good, but I found that if I buy the same Sargento cheddar cheese in individually wrapped sticks as opposed to a bag of slices (same ounces) it's actually about $.70 cents more expensive. Guess which one I buy?
Eating healthy, even for one person, takes a lot of thought and planning. Your kids are lucky to have a mom that's going to be building meals with their optimum health in mind. Best of luck to you!