My
DS fractured his tibia at 18 months. He had two x-rays in that time which were pretty straight forward and he didn't make much fuss. They basically took him in, laid him on a bed and took the xray. I couldn't go in with him because I was prg at the time so
DH took him in both times.
Obviously it's a different bone, but he was in a cast for 6 weeks. We ended up taking him to the Childrens Hospital at Westmead after getting the run around from local hospitals and orthopaedic specialists - best thing we ever did, they were fantastic. He was treated through the fracture clinic in outpatients.
He went through about 5 casts in that time because he kept braking them

If your
DD is anything like my
DS, it won't slow her down at all! He was up and walking again within 2 days. Although being her wrist it will restrict her more than his leg did I would imagine.
Honestly, while it wasn't the most pleasant thing to go through, it all turned out OK in the end.
I hope it's not fractured, but if it is, she'll be just fine I'm sure