blood coming from mouth

I was putting my rooster on a pole next to my silkie and he flapped his wings and my silke got knocked off. She landed on her side and started bleeding a little at the mouth, still breathing heavy, but there is no more blood. Her leg is now limp but we don't think it's broken by the knee...

I'm hoping to get some advice/help on what is ailing my hen. She's an Austrolorpe about 5 years old. She's been healthy (other than being saved from a hawk attack about a year ago, which she recovered in a day). We've had really hot weather here lately, lots of hot weather and although...