Hi Theresa!
It sounds like 2 gifts in 1 for your little princess :-)
A first trip AND a birthday trip no less. How special!
Disney is currently offering 2 pretty good deals guests can take advantage of next year:
One gives a 30%-35% discount on resort rooms for stays between 02/17/11-04/16/11.
The other are free Dining Plans on select dates going through 09/2011.
To get more details on both offerings, you can access the Special Offers page by clicking here.
As for her birthday, you can get a free "Happy Birthday" pin at any Guest Relations booth in the Parks. Just a little way for your daughter to get the extra special attention she deserves on her special day.
Also, if you inform the reservation agent, as well as the dining facilities on her birthday, sometimes they'll do a little something special such as a balloon in the room or small dessert after a meal.
So, take a look at the offers and see if there's one you can take advantage of.
May you and princess have a magical time!