Hi Laurie!
A trip to Walt Disney World in May will be such a great experience for your family. Your little girl will have the time of her life, and a trip to the Bibbidi Bobbidi Boutique will send her flying like Tinkerbell! While both locations of BBB are top notch, guests always have their preferences. The Magic Kingdom location is obviously very popular, since it's right in the middle of the pixie dust. I actually prefer the
Downtown Disney location of Bibbidi Bobbidi Boutique, since we can visit during our resting day. Also, the reservations at the DTD Bibbidi Bobbidi Boutique are a bit more available. You should be able to make a reservation for the time, or at least around the time, you desire.
Either way, your 4 year old princess is going to enjoy her transformation, and it will be a memory that neither of you will ever forget.
Wishing you lots of fun on your trip and feel free to ask us any more questions you may have in the future.
Have a fantastical Disney day!