Hello Victoria!
Congratulations on your family's very first trip to Disney World!!!! WOO HOO!!!
Your family is going to LOVE the Disney Dining Plan! This really does save you money, especially since you have a daughter who wants to dine with some of her favorite Disney Characters!
I would HIGHLY recommend you making Advanced Dining Reservations (ADR) for all of your table service meals. If you do not make reservations, you run the risk of waiting for a VERY long time in being seated at any Table Service Restaurant. Making reservations is SO easy...all you have to do is click
HERE or call 407-WDW-DINE.
I would recommend the following Character Dining Experiences for your Princess:
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The Crystal Palace - Magic Kingdom (Winnie the Pooh and Friends)
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Akershus Royal Banquet Hall - EPCOT (Various Princesses)
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Hollywood and Vine - Hollywood Studios (Playhouse Junior character's Handy Manny, June, Leo, and Special Agent OSO)
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Chef Mickey's - Disney's Contemporary Resort (Mickey Mouse and Friends)
I hope this helps in your planning! If you have other questions, please let me know!
Have a MAGICAL day!