It is established in the film that it is the use of a contaminated washing up powder that has caused the women of the village to turn into zombies. The film also stipulates that only exposure to the washing up powder will cause infection. Based on this, how can Candy also turn into a zombie after having not been to the village before, nor using the washing up powder herself?
When Matt is attacked by the scissors lady outside the house he is fighting her and the camera changes and the lady is not there and Matt is just pointing at the other women. Then the camera changes back and Matt is still fighting the scissors lady.