Is she vegan or ovo-lacto? My daughter has recently decided to go ovo-lacto as well. I found that most of the vegetarian-kid Web sites are geared for vegans, so it's actually been a little hard to find resources for that.
Here are some things she likes for dinner or in her lunch box, My kid's not super-picky (as kids go -- compared to an adventurous adult, she's pretty limited), but she doesn't really like her food "mixed," so my suggestions are geared to that.:
If we're doing a dinner with multiple dishes, she'll have the starch and veggies with us, and can make herself a scrambled egg instead of the meat portion, or she can have some plain beans.
Stuffed baked potato.
Pasta with a meatless sauce -- or, if she won't touch the sauce, buttered noodles with beans/cheese/egg and a vegetable on the side.
Hummus or bean dip and pita bread.
Deviled eggs (OMG, she LOVES THESE).
Homemade bean-based or lentil-based burgers.
Beans right out of the can -- especially chickpeas.
Cheese and crackers, obviously.
Noodle-veggie stir fry, customized with the vegetables she likes.
Smoked or BBQ tofu, in a sandwich or just eaten straight.
Pizza with olives and mushrooms.
Sliced raw veggies.
So we mix and match from that list -- deviled eggs, some crackers, and a handful of grape tomatoes. Or a quesadilla with some flavored tofu, sugar snap peas, and strawberries. Or we'll make pasta and save some out for her without the meat-based sauce. It helps that the adults like vegetarian food too, so we have no problem eating veggie a few nights a week.
If you want cookbooks, the Moosewood series is a pretty good source for kid-friendly recipes. And Mollie Katzen's cookbooks for kids are great!