Hi Preetha,
According to the
Park Rules, Guests under age 14 must be accompanied by a Guest age 14 or older to enter the Park. To board an attraction, children under age 7 must be accompanied by a person age 14 years or older.
This is great news as it means that there won't be any issues with your 9-year old daughter riding an attraction on her own.
I would recommend that you speak to a Cast Member as you enter the line at each of the attractions which your daughter is going to ride on her own. Explain the situation and ask them if it would be possible for you to wait in line with her until she reaches the front and then meet her at the exit.
If your daughter meets the height requirements for the following attractions and would like to ride them, she will be able to join the Single Rider line where wait times are typically less than half the time of the regular line:-
1/ Test Track at Epcot where the height requirement is 40in (102cm) or taller.
2/ Expedition Everest - Legend of the Forbidden Mountain at Disney's Animal Kingdom Theme Park where the height requirement is 44in (112cm) or taller.
3/ Rock 'n' Roller Coaster Starring Aerosmith at Disney's Hollywood Studios where the height requirement is 48in (122cm) or taller.
Wishing you a magical trip filled with memories which will last a lifetime!
Emma