Simona,
Let's start with the weather. The National Weather Service says that for Orlando in March the average temperatures and rainfall are;
- Average High Temperature: 78.8 degrees
- Average Low Temperature: 55.9
- Average Overall Temperature: 67.4
- Monthly Rainfall: 3.54 inches
So make sure you have a light jacket/sweater for the evenings, as it can get a bit chilly.
For character meals for a little girl who loves Mickey, there is none better than breakfast at
Chef Mickey's in the Contemporary Resort, followed by a day of fun at the Magic Kingdom!
Since you are there several days and will definitely want to hit more than just the Magic Kingdom, I would make sure to do
Donald's Safari Breakfast at the Animal Kingdom, and then enjoy all the amazing animals and shows at the park.
Finally, if she likes to watch Playhouse Disney, definitely do the
Hollywood and Vine character meal at Hollywood Studios. It is not Mickey and company, but she may be familiar with these characters.
Please let me know if I can offer any other suggestions by asking me a question at my bio page.
Have a magical (and delicious) vacation!