I don't know anything about any inquisitor so I can't really make a call on that. What I can make a call on is that being neutral implies not caring about good or evil. Hags do care, and they will choose to be evil and cruel at every opportunity. She does what she does not because its the best way for her to get what she wants, but because the cruelty and suffering is part of what she wants, even when not being cruel would take less effort.
Also it's not even truly a case of "stay out of her way and you'll be fine. She does seek prey. You say yourself that her sister sent Mayrina. That's not random chance, that's coordination within a coven. Either Ethel put the word out she was looking for a victim to get a baby, or her sister simply saw an opportunity and took initiative. Either way that's a conspiracy to find and lure a vulnerable victim, undertaken by at least two, probably three very old, powerful and manipulative beings that by nature seek to harm. And its not like Mayrina, a grieving widow, had other viable options to bring her husband back. Bringing the dead back via clerics would cost far more than a villager could ever afford, hundreds of gold.
