Beat the Ruin on a different world, came back to mine and cannot progress.

I beat the Ruin with my character on my sister's world (playing co-op) and now going back to mine none of the balls were collected. I re-ran the missions on my world and got the first five (the sixth being given to you by the old woman) but when I go talk to her to get the sixth she doesn't do it. Can I not do the Ruin/get keys on my world now that I beat it on hers? Am I missing something? I reran every mission I had available to me. That would be a huge bummer.

I do not have any mods on...

Beat the Ruin on a different world, came back to mine and cannot progress.