I'm glad we have first hand experience of a complete femur fracture healing, 
@Jenbirdee.
That femur needs immobilizing --important for the next few weeks until it has developed callus to hold the bone together, and then for a further 3 weeks until the bone has knitted together from the two sides.  
It maybe that using vet wrap is all you can do -- splinting the femur would be difficult.  But if you can wrap vet wrap round the thigh and then wrap the thigh in anatomical position against the body [as if the duck were sitting] that would be better than nothing, which depends on the duck voluntarily remaining immobile. Keep her quiet and warm in your house -- in a pet carrier when you aren't with her during the first three weeks.  She could sit in a ducky princess bed or on a ducky wheelchair when you are with her, but don't hang the broken leg through the hole in the wheelchair sling for the first 3 weeks. AND after that be extra careful putting the injured leg through the hole if you do put that leg through
She should not swim for the first three weeks. Even if her feathers get pooped on, that femur needs to be immobile.  
The first image is of a duck confined to a cardboard box inside a clear tote [the tote is to stop him trying to stand up
The second is the same duck in his "princess" bed.  Both of these set ups have the disadvantage of the duck sitting in poop
The third image is two or three weeks later swimming in the tote.  It's deep enough for the duck to swim [which wading pools aren't] but he didn't use his left leg.  
The fourth image is of the duck in a ducky wheelchair which let his good leg hang down and had a midline split at the back so that the poop fell down on a puppy pad below.  This was by far the most hygienic set up but is only good if the duck doesn't try and stand up and get out. My little one had stopped using both legs by the time he got his wheelchair [it turned out he had a pelvic tumor pressing on nerves but I didn't know that for certain until he died 6 months later, and the tumor was visible by his vent.]