Our old hen MaMa white

This is mama white. She is the elder hen of the the flock. She is 9 years old probably close to 10 years old. This first photo is from yesterday and the next ones are from today. Her comb and face went from red/dark red to almost purple today. I went to pick her up and bring her inside because i dont know whats happening and she isnt moving at all. As soon as i grabbed her a bunch of slime oozed out of her mouth. Im sure im probably going to have to put her down but any advice please and thank you