3 ideas
A person denied every other form of agency or pleasure fixes on a single possession as the one thing that is fully hers, and guards it past reason. Their value to her is proof of ownership, not use, so her attachment outlives her body and becomes the haunting itself.
The household's men live off the memory of landed wealth while doing nothing, and the family sinks. Stored wealth only preserves the family when someone converts it into productive enterprise. The one who does this is the young woman with the least formal standing in the house, not the men who formally inherit.
The dead aunt's crude, uncensored speech says what a respectable widow could never say aloud in life: resentment at a marriage and a youth taken from her. Reading the ghost as a vent for silenced women's anger turns a comic haunting into a record of injustice. Her gradual alliance with the bride, and later with the bride's daughter, shows a grievance softening once another woman lives the freedom she was denied.