Re: We just got a swarm. Have some ?'s
if you have enough bees in there, they should be able to keep that frame warm, but there may not be enough foragers and guard bees.
if the bees are flying good, it's plenty warm.
again, i would not attempt any of this at this time of year.
but on the brighter side, it's giving you a good learning experience, and if they make it under these trying circumstances, you might have some good bees there.
the biggest problems to me are:
not enough bees
not enough stores
not enough time
the queen might have been superceded due to age or poor performance.
i'll let some of the others chime in.
disclaimer: novice beekeeper here who knows just enough to be dangerous