Cleo - new site and teething problems

I popped up to see my mother-in-law today and nipped around for a quick look at the hive with no plan to open it since I was hoping the queen was hatching/mating/starting to lay and I wanted to stay away.

Here are some pictures of what I still think is one of the prettiest gardens I've ever seen.

Beautiful, eh?

The hive is on a flat roof, hidden by the house, and easily accessible from a high area of garden to the rear. South facing and totally sheltered. Perfect.

Not so perfect was what I found when I got there. A small band of bees (~50) were on the house roof above the hive. Puzzled, I peered up and saw a queen. I had only set this hive up very recently with no queen and a few queen cells. This was one from there. I noticed she had a slightly damaged wing on one side, but she looked big and beautiful apart from this. I picked here up, put her on the landing board, and she crawled into the hive.

What have I done? Why did I do it? I am at a loss to know what was going on. The group of bees around here had been fanning. Sign of a cast swarm? Had she tried to make a mating flight and been hampered by a damaged wing? Why was it damaged - misformed in the cell? Had she been on a mating flight and tried to return and just not quite made it? I decided not to open the hive to see whether there was another queen in there. Perhaps I should have just left here where she was. Or perhaps popped her in a box and kicked off an new colony with her. I think more may become clear when I open the hive in a short while.