I hate to tell you this, it seems that the behaviors of most mothers with BPD worsen as they age and become even more dissatisfied with their lives. As her target, you might want to consider documenting all her behaviors, so if you need a restraining order at some point, you will easily get one. My understanding is that keeping a notebook and writing down the incidents as they occur in order, counts as legal documentation for court. A restraining order might include her not harassing you while driving which if you have plenty of documentation of and a restraining order, could allow you to call the police when another incident occurs. There can be some serious consequences for disobeying a restraining order including jail time and fines.
As far as the smear campaign goes, it is unfortunate that so many people believe that all mothers are saints and should be revered. I have found a few people who do get what I am talking about when I describe all the abuse I have suffered at the hands of my large narcissistic extended family. People who work directly with the elderly can be particularly understanding that some senior citizens are difficult and this is how they have always been, though it is more apparent with age as the masks slip.
I’m going to take your advice and start documenting the bizarre behavior because while I thought I’d never need to take out an RO on my mom (and that awful guy she lives with), it may be necessary if they continue. I work from home four 10’s so my time on the road is limited to predictable but limited days, they’re retired and are on no schedule, my husband commutes about 30min each way.M-F. They seemed to have honed in on him since they know for sure when he commutes.
Her mask slipping in old age is real! A lot of the people we both know and I’m sure others think my mom is so sweet. Saves the stray animals (but doesn’t actually care for them), checks in on the nearby, very elderly neighbor (95+) but because she knows it makes her look good, not because she cares all too much. Always soooo nice when people are paying attention.
Meanwhile I’m exhausted trying to work and get through menopause, my oldest child (adult aged) has mental health issues, I probably don’t look friendly (

), and just want to be left alone. I don’t want to convince her friends and neighbors to not believe her (they’ll believe what they want) and mostly just wish it would stop. While also knowing I can wish what I want but it makes no difference.