Welcome! It's wonderful that you're making this change for you and your daughter, and that you're including her in shopping and planning. One thing I do with my kids is that each of them plans one dinner per week. They know that a dinner needs to have a protein, a carbohydrate, vegetables (and often fruit for a dessert). They enjoy planning and helping cook the meal, and I've found it's a natural way of teaching them what healthy options are. It also makes them much more open to trying new things.
Does your daughter like fish? It doesn't really work for lunch, but it's a quick dinner option, and there are lots of good, basic fish recipes. Another thing my kids like to make is oven campfire stew. We make ground turkey meatballs (we just mix the ground turkey with salt, pepper, and whatever spices we want), and cut up potatoes and other veggies (carrots, squash, broccoli, asparagus--anything) into chunks. Then each person gets a large square of foil to fill with meatballs, potatoes, and veggies. Then we season it how we want, wrap it up securely, and roast it at 400 degrees for around half an hour. It's great because it allows for customization if you have different tastes in your household, and it's built in portion control. Cleanup is easy too

. Have some strawberries and hot tea for dessert, and you're all set!