For future reference, while I've only dealt with toes curling downward and inward, or to the side, you make little "waffle shoes" from a piece of thin, stiff cardboard (think a layer or two of cereal box cardboard) or cutting an old grocery store member's plastic card to size. Then tape the toe to it, and then wrap the whole foot.
I assume with your case, one could tape the cardboard to the top of the foot to better press downward with firmness, but we have only done cardboard on the bottom of the foot.
They walk funny for a bit but it doesn't slow them down much. Ideally you would reapply every 24 hours but we have gone 2-3 days. You have to watch to make sure the foot is clean before rewrapping. Do that for about a week and the toes tend to go in the normal direction.
You probably wouldn't want to breed that silkie, so hopefully it's a hen so you can easily eat the eggs instead of of allow them to hatch.
An interesting thing that I read that may or may not be true-- if there are heat spikes in the first two weeks of incubation, the fetus is obviously more likely to die. But the last week of incubation, heat spikes are more likely to cause leg and feet deformations.
Because both of the toes being shorter and no nail, my guess is it's a genetic thing being passed on.