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I don't know about a wrist injury. But a few years ago, Hubs and I went with a couple and the girlfriend has recently fractured her ankle. She was using crutches, but for being in the parks we rented a wheelchair from guest services. At most rides, we were taken up the exit and got to skip the lines. It was kind of awesome - we rode at least twice the amount of rides as we would have.

ETA: That stinks about your daughter! Hope she's not in too much pain and is still able to enjoy the parks!

Oh no!!! Your poor LO

Disney replaced their disability assistance policy a few years ago and now it is much more difficult to get. People were really abusing the system, even "hiring" people with disabilities as guides to spend the day with them so they could skip lines

You could try speaking with Guest Services if you really think your Dd would have a hard time waiting in lines but generally a broken bone wouldn't qualify.
More info: http://wdwprepschool.com/guide-to-disability-access-service-das-at-disney-world/

Hope you have a wonderful trip, regardless! We will be there too next week - and I can't wait!