I have to second vegan yum yum. It is an amazing food blog, and I've tried two of her recipes in the last week with great success (my husband is the picky one in my family...the six year old will eat anything, but the husband? not so much).
If your daughter likes salsa, make a fresh, really yummy one and keep the fridge stocked with it. She can dip chips in it or crackers.
If she likes guacamole, make some of that and she can dip veggies or chips in it for snacking.
If she's a potato girl, roast some potatoes in the oven with a bit of olive oil and salt and pepper and garlic, then smother them in a vegan gravy (maybe still calorie-rich, but it will remind her of pot roast and fill that savory craving without cholesterol and obscene fat content).
Learn to make hummus. there are great recipes online. Everyone loves SOME kind of hummus with pita chips or bread.
I remember snacking a lot as a teen. I hope some of this can help alleviate her cravings for "normal" snacks that she's used to. She probably feels a bit like she's been put on a "diet," too, and who doesn't rebel against that feeling? She will find some things she enjoys, and then it will all smooth out. Good luck!
My son (5) has always been averse to meat (I think it's a texture issue) and he's also very picky. He loves Smart Dogs and Boca Nuggets. Since they're processed, I try to limit them, but they're a nice "junk" food kind of treat. You can find them in just about any supermarket. Morningstar farms also makes some nice products and I've found them at WalMart in the past.
Just a note, if there's a food coop in your town, check it out. They normally have a tremendous variety of vegan friendly foods and I've found some items are cheaper than chain stores. They also provide bulk discounts which can be quite significant.