Welcome to planDisney, Keona!
Strollers are vital if you're taking little ones to Walt Disney World. Those little legs need to rest from all the walking around. As parents, it's also nice to have a place to store all our stuff!
Keona, the current rules state that
stroller wagons are not permitted inside Disney theme parks. Therefore, even if your wagon fits within the dimension restrictions for a stroller, you would still not be allowed to bring it into the theme parks. I realize that's not the answer you wanted to hear, Keona. Hopefully, your child will be so excited (and tired) from all the Disney fun that she'll be okay lying down and napping in a regular stroller.
There are also helpful
Baby Care Centers located in each of the theme parks. These are wonderful places for parents to take little ones when they need a break from all the stimulation. You can use them to change diapers, feed your child, or even purchase much-needed supplies (e.g. food, wipes, etc.). They're nice and quiet so kids can nap or simply rest until they're ready for more character hugs!
I hope that's helpful, Keona. Thanks for choosing to be our Guest.
Mike