No rules in regards to Celebrating. If you want to celebrate her Birthday while there then by all means do so. Give her the button and let her wear it the whole trip
ETA - I did the same thing for DGD's 5th birthday celebration. Her BD is March 11, which last year pushed really close to Easter and Spring break. To avoid those crowds we went 2/28 to 3/10. She wore her button every day, had cake delivered one day, and my siggie pic is of her enjoying the chocolate slipper at CRT that was to celebrate her birthday. In my opinion, we made that trip FOR her Birthday celebration. Had it not been for that, we wouldn't have been there then. So we celebrated it the entire time.
Celebrate it! My birthday was Jan. 4, but we weren't in Disney till Jan 18-25. I wore my button the whole week. We were celebrating my birthday so I wore it. In fact one meal our friends had ordered a Minnie Mouse cake for dessert! It was a wonderful way to spend my birthday.
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