Welcome to the DIS, Jeremy.
Make sure to stop at City Hall and ask for a birthday pin. Your DD will be the hit of the day with the CM's and even some guests as they see the pin. Also, while there at City Hall, ask the CM if there is a phome message for your DD, regarding her birthday. They will give her a phone with a message from Goofy. I just did this with my DD, Natalie, in Dec, and she was 24. Best smile ever.
Also, if you have time, in guest services, at each park, including DtD, a birthday pin is available, all different, except MGM is the same as MK (at least it has been in the past).
If you have sitdown meals, make sure the PS is noted with a note about her BD, and let CM at checkin know also.
Enjoy the magic, nothing better than a birthday at Disney.