In the novel Reverend Parris summons Hale to Salem when Betty is sick because?

In Arthur Miller's play "The Crucible," Reverend Parris calls Reverend Hale to Salem when Abigail Williams falls ill, not Betty Parris. He believes that Abigail might be suffering from witchcraft or demonic possession and seeks Hale's expertise to investigate and deal with the situation. Hale's arrival sets in motion the play's events and the subsequent witch trials in Salem.