Re: Reviving a flagging colony
I am no expert so take this for what it is worth. Your weak hive won't be able to keep a full frame of capped brood warm so you need to add nurse bees as well. They typically hang out on uncapped brood frames. Perhaps brushing a frame of nurse bees from your strong hive into the weaker one along with the frame of capped brood is a possible solution.
I am not an expert beekeeper but I did stay in a Holiday Inn Express last night.
Raising Vermont Bees one mistake at a time.
USDA Zone 5A