Rattlesnake

Rattlesnake is a movie starring Carmen Ejogo, Theo Rossi, and Emma Greenwell. When a single mother accepts the help of a mysterious woman after her daughter is bitten by a rattlesnake, she finds herself making an unthinkable deal...
After a mysterious woman saves her daughter from a deadly snakebite, a single mother must repay the debt by killing a stranger before sundown.