Kipps finds a baby bird that fell out of a nest in the fireplace. It's possible the titular ghost tried to kill the chick as well due to not having access to the town at the time or just not willing to allow anything to have surviving children.
Worse, Alice Drablow lived alone in Eel Marsh House with the ghost of her vengeful sister. For years.
Worse, the WIB kills when seen, and Mrs. Drablow is both the target of her hate and living at the place she most haunts. Her continuing to live there makes it nigh impossible not to trigger sightings, and thus cause deaths. Mrs. Drablow must have known she was triggering child deaths in the town, and in a way her staying in that house meant she was at least partly to blame for a ton of deaths. So is she a victim, victimizer, or supernatural proof step-mother that never saw the ghost?
Arthur finds several pictures with threats and insults written in red while in the house. It hints that Jennet was a psychic, just like Mrs. Daily, and that her sister and the townspeople held it against her and took her child away for it. Which would then make Jennet Drablow a Tragic Villain Expy of Lily Evans Potter, especially considering her sister Petunia, who hates her for being a witch. Imagine if Lily chose to remain a ghost to watch over Harry, and the Dursleys got him killed somehow...