How many movies have Lisa M. Hansen and Sarah Willgrube collaborated on?

They have worked on 3 movies together! Their first movie together was Earthfall (2015) while their highest rated movie together was I Spit on Your Grave III: Vengeance Is Mine (2015). They have not worked together since I Spit on Your Grave III: Vengeance Is Mine (2015). They are most known for their thriller films together.