We (my family) travel alot around here. I have a few ideas for you depending on how much she wants to spend and how long of trips:
1. Great Wolf Lodges are a little expensive but are great for older kids who like water activities. We have been twice and would love to go three.
2. Kings Island in Ohio seemed nice ( we were not able to go when we were in Ohio last)
3. Any large zoos ( I live in PA and just went to the Philly Zoo a few weeks ago. It was a blast.
4. Hershey Park ( also something we went to in June of this year). That offered many things, including chocolate products obviously. There is an amusement park and chocolate world that has many different tours and taste test options.
5. Knobels, a free admission theme park in Elysburg PA, has many large attractions. We actually just went today and we could ride anywhere from 3-10 rides for very low costs (estimated under $60 for whole trip including parking and family of 5).
6. Virginia Beach, or any beach for that matter, has a boardwalk with rides on the edge of the beach. It's clean, friendly, and has hotel options on the beach. We stayed for 3 nights & 4 days in July.
i sure hope these help you plan the next best trip for your family. I forgot to mention I'm turning 16, my sister is 13, and my brother is 12 so these options should be around the right range.