My young chicken was walking thru some plants with her six buddies. I noticed she was hung up in something. She got loose but I went and looked and a cottonmouth snake had bitten her right foot. She ran away and then started to limp. I dont know what to do, any advice. She lived overnight and walked around today but her foot that was bitten is swollen and turning black. I wanted to know is there anything I can do for her. HELP please.