What kind of chicken is she? if she's a heavy breed (Cochin, orpington, etc-) after you rehab her you should lower the roost, because they can get sprains from jumping off high things. I had a Cochin that had this same problem, and I just separated her for a few days in a dog kennel until the...
If you haven't already, separate her from the rest of her flock until her comb heals up a bit. comb wounds aren't usually a serious problem, just keep it clean and maybe give her some electrolytes. good luck!
As a general rule, I Keep standard chickens separated from bantams, because bantams are usually bullied in a flock of larger birds.
and yes, there always bantam sized.