If they are flying and collecting pollen, that is at least a good sign.
Unless you take action to covet your small colony it will not survive because the queen will not be able to lay enough brood because the bees can not keep them covered and feed an expanding hive. Hence the term 'dwindle' - the numbers game, I'm afraid. As I said earlier, small warm space and feed is about all you can do, but a frame of hatching brood may well be a superb antidote which would very quickly result in more brood rearing capacity and then more foragers in 2 or three weeks time. An increasing spiral instead of the reverse.
A lot of us simply cut our losses and unite with another colony (we can do better by splitting later) or even out our brood a little between colonies, and the problem goes away at an early stage. Such are the advantages of more than one colony........
The one thing I would not be doing now, if it is dwindling rapidly, is to make them draw out fresh comb. They simply do not have the energy or the time, IMO. Once they are in an 'expanding' mode would be the time to change the frames, speed of changinging dependent on local observation.
Regards, RAB