Hi Jannette!
Thank you for visiting the Moms Panel!
I would recommend mentioning to the Front Desk of your Resort that you want to surprise your daughter with some balloons. Nothing can be guaranteed, but you may find that they might deliver a small bouquet of balloons for you. If it is for her birthday, there is an even greater chance that they might do so.
I do not know for sure if Everything Pop has balloons for sale, but if you want to organise a really special in-room surprise for your daughter, take a look at the website for the
Disney Florist - they have gifts for every occasion and to suit every budget, and can deliver to your Resort hotel.
If you have any other questions, please come back and ask me - I would be happy to help you plan your magical vacation!