Hi Daniel!
How great that your daughter enjoys such a variety of foods! My 4 year old son loves fish, as well - grilled fish of all things! I'm thankful that we don't have to do mac 'n cheese every day, all the time!
With the Deluxe Disney Dining Plan, you have some really great choices. I highly recommend that you make some reservations for some of the restaurants that offer buffets, so that your daughter will have the same choices the adults have. On the upside, many of these are Character Dining venues, so that's an added bonus! However, not all of them are.
To find out which restaurants offer the buffets or family style dining, you can check this website:
Buffet/Family Style Restaurants at Walt Disney World.
For more information on your specific dining plan, go to this website:
Disney Dining Plans. You can then click on your specific plan located in the box on the right side to download a great brochure to read about specific restaurants included in your plan, and how many credits each one requires, etc...
If you have any further questions, please don't hesitate to ask me. I am happy to assist in any way I can.
I hope you all have a magical time at Walt Disney World!