I see. Thank you for clarifying the situation for me, Nancy. It does sound as though your concerns are justified.
Since it appears you have attempted to rectify the situation with the individual and management to no avail and because of the risk to your mother's health if this conduct continues, I would typically retain a local attorney to represent her at this point to communicate a demand to the neighbor that she cease such conduct or risk legal action being taken against her.
If the demand is not successful in promptly stopping the conduct, then an ex parte petition for an anti-harassment order can be filed with the local court on your mother's behalf. Once an order is obtained, the neighbor would typically be prevented from continuing to harass your mother. If she did, she could be arrested as violating the court's order. The threat of such an order coming from an attorney may be enough to motivate the neighbor to stop acting unreasonably.
Here is a link to the applicable code providing for an anti-harassment order:
It would not likely be worth pursuing a complaint for damages under these circumstances, but I would certainly take steps to compel the neighbor to cease such conduct, including an anti-harassment order if necessary.
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