Maybe gently wrap that leg with some of that stretchy vet wrap tape, or just watch and wait, and make sure she doesn't have to walk too much to get her basic necessities?
I think I'd have my two surviving hens sleeping in a cat carrier, inside, in the bathroom, or something, just to remove the Bear Buffet. All garbage sources would be locked away, as would compost bins, etc....
I'd also be *safely* standing guard in a lawn chair with some sort of "deterrents" (whatever you are comfortable having, and whatever is legal for your neighborhood). A quick getaway strategy into the house/garage is a must! Make your yard and coop as distasteful and unfriendly as possible now. Let the bear know it was a One-Time-Only thing, not the Sunday Senior Special at the Casino!
I'm so sorry for the loss of your flock. Good luck!