Hi there, Madai. I am so sorry to hear that your niece ended up sick, and your day wasn't as magical as you would have liked.
You are able to book a new
Disneyland theme park reservation. However, depending on whether you have booked all available reservations for your
Magic Key, you may need to wait until tomorrow to book a new reservation. Unfortunately, you must modify or cancel any theme park reservations the day before by 11:59 PM (Pacific Time) to avoid a No-Show on your Magic Key. A No-Show stays on your account for 90 days. If you have three No-Shows in a 90-day period, you will be unable to cancel, modify, or make park reservations for 30 days. However, No-Shows happen! So no worries if this is your first one.
Madai, did you know that you can see how many No-Shows you have on your MyDisney account by logging into the Disneyland website? Find the "My Disneyland" tab on the main page and select "Ticket and Reservation Details" in the drop-down menu. Click on "Make or Modify Park Reservations," and it will show all of your upcoming reservations. Select the "Book Theme Park Reservations" button, and the next screen will show you the number of No-Shows in the 90 days under your name and Magic Key information. You can also book a new park reservation on this page!
Hopefully, this information helps, Madai. I'm wishing your niece a speedy recovery, and sending lots of pixie dust so you two can get to the
Happiest Place on Earth soon!
Have a magical day,
Melissa