Here's photos of my pekins with the hobbles and a video of her walking after she'd been wearing it for awhile and taking the vitamins, so on the road to recovery.
If you feel that her legs are pushing out to the side you can hobble her with one inch vet wrap. Make a little loop around each leg, then a larger loop (which goes around those loops and sticks to them) which holds the legs in proper position. Just keep that on her all the time except when she...
That doesn't really seem like splay leg, where the legs go out to the side and the ducklings have a hard time standing up and moving around. It doe seem like she's walking a bit stiffly though. Are your ducklings contained to a brooder or do they have free reign of your home? I wonder if...