Your hen will be fine, a like
@anna-newhampshire said, a broken leg is completely curable!
So, the treatment depends upon how severe the break is. (start with the not-very-bad-break, and if the leg keeps twisting, take off that splint and try the next on)
For a not-very-bad break: First thing to do is get a popsicle stick, cut it to the length of your hens leg (or a little shorter), then grab some gauze. Put the popsicle stick agains the hen's leg, then start at the top of the hen's leg wrapping gauze to secure the popsicle stick. Careful, don't wrap it to tight!!! Once you get to the bottom of the leg, wrap the gauze under the foot and around the toes a bit to anchor it. Secure both the top and bottom with medical tape (apparently vetrap works well).
if the hen's leg keeps twisting with the popsicle-stick-and-gauze splint, take that off (by cutting it off, never pulling), and try this splint; this one is stronger. Get a piece of hose, like a watering hose, and cut a slit up the side. Make sure it is tight enough to hold her leg in place, but
not so tight it cuts of circulation! Have another person pick her up gently, then you can wrap a bit of gauze around the leg so it has some padding. Again,
be careful that you don't cut off circulation! again, for the gauze, start at the top of the hen's leg wrapping gauze.. Careful, don't wrap it to tight!!! Once you get to the bottom of the leg, wrap the gauze under the foot and around the toes a bit to anchor it. After wrapping the gauze, secure it with tape, not by tying it. Next, take the piece of hose and put it around the leg (this is what you needed the slit in the hose for). secure the hose with medical tape.
When the time comes to remove and/or check on the leg,
cut the tape off, don't try to pull it off! pulling it off can re-break the leg.
If the break is REALLY bad, then go with the chicken sling idea. You only need a chickens sling for a very very very bad break
Well, I hope that helped
