This hive will be a young queen. Young queens sometimes lay erratically at first. Give her another couple of weeks, as this could indicate that she was poorly mated.

Thanks for the reply, ccrb. Do you know why they woudn't be foraging?

I am not an expert but in a similar case with mine, they continued full forage duties. In a month you should see eggs.
Is there a chance you killed the queen at some point?
Do you know what a drone cell looks like? I have a weak or dead queen in one hive and all you get is drones, which only eat eat eat not forage or help around house.
I read that you should crush all queen cells, so I was doing this (wrongly!). The bees still swarm only there is no queen left remaining. This whole summer has been putting hives together as there is always one queenless.
You may just want to do the newspaper method and put your hives together, if there is a queen the strong one will prevail. You need a good supply of honey/bees for winter and it's getting into fall.

I think I would just combine them with the newspaper method. If they are really suffering for numbers, then this might be the best way to get through the winter.