Hello Rosa!!!
I am already singing "Happy Birthday" with your family!!!  That is going to be so much fun, AND on Valentine's Day!!!!  Wow...this is going to be a great day!
I would first start 
HERE to find some really great ideas for daughter's very special birthday!  You can even order magical items to be delivered at a restaurant or a specific venue in one of the Disney Theme Parks!
Another idea would be to make a reservation at one of the incredible restaurants located throughout Walt Disney World.  To make reservations and find the perfect restaurant for your daughter, click 
HERE!  You can also order a special birthday cake for your celebration by calling the Cake Hotline at 407-827-2253.  They just need 48 hours notice to make an incredible birthday cake!!
I hope this helps in your planning!  If you have other questions, please let me know!
Have a MAGICAL day and a Happy Birthday!