Raising their leg can also mean abdominal pain. With injury, you may see a bruise appear around 2-3 days after injury where their skill will turn green. Did you check the pads if her feet for scabs?
The above being said, leg injury wouldn't cause sudden death.
Let's look at your other ill hen. Blue in the comb would typically mean poor circulation or breathing issues.
Chickens can handle cold weather quite well, but do very poorly if they are overheated.
You should get your sick hen indoors in a cool quiet place - put some old towels down and paper towels over top so you can see what her poos are like. That can be a good indicator if what's going on.
Provide her food and water and monitor how well she's eating and drinking. Give her crop a check to see if it seems like she's eaten today.
This should get you started. If you have any rescue formulas, electrolytes or boosters, I'd give her a dose to hopefully help perk her up.
How is her breathing? Any fluid or gunk around the nostrils?
The above being said, leg injury wouldn't cause sudden death.
Let's look at your other ill hen. Blue in the comb would typically mean poor circulation or breathing issues.
Chickens can handle cold weather quite well, but do very poorly if they are overheated.
You should get your sick hen indoors in a cool quiet place - put some old towels down and paper towels over top so you can see what her poos are like. That can be a good indicator if what's going on.
Provide her food and water and monitor how well she's eating and drinking. Give her crop a check to see if it seems like she's eaten today.
This should get you started. If you have any rescue formulas, electrolytes or boosters, I'd give her a dose to hopefully help perk her up.
How is her breathing? Any fluid or gunk around the nostrils?