Did you see any little babies(larva) or eggs?
I just replied to a post a minute ago and mentioned about switching the hives around for foragers to switch places and trade hives. I dont think this will work if there is no queen.
Little babies and eggs mean that there is a queen..No babies and eggs mean no queen. No queen means trouble.
If you dont have a queen You will need one, either by buying one from a bee farm or trying a frame from another hive with eggs and brood on it and put it in the slow hive(you'll have to take a frame out of the slow hive so the other frame will fit)
Or, like what i've also done ....Combine what you have left in the hive with the strong hive using the newspaper method.
I'm assuming you have only 2 hives...This is DEFINITELY better than having only one hive...This leaves you options with more than one hive.
My methods arent "By the book" sometimes. I'm only in my second year of beekeeping but i have had my share of questions and problems and i still have bees( a miracle!