Final answer:
The passages do not provide enough information to determine Abigail's motivation for frightening Mary Warren, Mercy, and Betty.
Step-by-step explanation:
Abigail's motivation for frightening Mary Warren, Mercy, and Betty with a "pointy reckoning" is not clear in the provided information. The passages given do not directly explain Abigail's intentions or actions. It is important to have more context or information to accurately determine her motivation.