Answer:
He means that Carrier has cast a spell on people.
Step-by-step explanation:
The word "bewitching" was used in the sense of "wearing a charm", so the author shows that Martha Carrier was accused of witchcraft because, according to her accusers, she had the ability to attract them, dominate them and exercise them a power that was evil, like a charm. These accusations were so powerful that they even had the ability to enchant Martha's inquisitors, making them look for more witnesses and until it was impossible to absorb her from the crime for which she was being tried.