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Is the door shut on this room quite often. If it is you may want a cold air return duct in there.
Or I have heard and seen a duct booster. It hooks into electric and it's a fan, when your furnace turns on the booster turns on. It creates a suction and blows more heat into that duct. I've seen that at my local hardware.
Experts, feel free to correct my info on here.
We live in a very old farm house and the heat does not travel well to the upstairs either. As one baby's room shares the vent with the bathroom and the other shares our vent, we just blocked off the bathroom and our vents to push more heat into theirs.
We also completely sealed off their windows to keep as much heat in as possible.