I had put all my fish back into the pond two nights ago.

All the fish started the mating immediately.

One of the Goldie is injured badly and scales all gone.

There might be other fish that is injured also.

Should I leave them alone and wait to see what happens.

Taken her out to a recovery tank?

There are three or four females and five males.

PondandFish

PondAndFish, what I would do is get a cheap plastic container with holes, found in any dollar store or Walmart. It floats, and your injured fish can recover in it while left alone by the other fish and still enjoys the advantage of filtration. The scales will eventually grow back, it just takes a while.