How to thank my wedding planner? Unusual situation...

When I lived in CO, I worked for a wedding planner for a short time. While I decided that event planning wasn't the career path for me, I kept in touch with the owner of the business and we've become friends. Fast forward to this past year, I knew I needed a "month of" as we're planning a CO wedding from FL. Of course, she was my first choice. She's giving us a rocking deal and I am trying to think of the best way to thank her! Shes giving us almost 50% off of the month of coordination package and waiving almost all of the other costs. The only other thing we will pay for is her travel and lodging. On top of that, she is doing so much more than month of planning! She has put together tons of ideas for me, shes scheduling vendor appointments for when we visit CO, etc. Essentially shes giving us a full/partial planning package. Obviously I'm planning on posting a great review and writing her a heartfelt thank you note. But what would be an appropriate thank you gift? Cont. in comments...