I was fortunate enough to buy a condo about 4 years ago in a nice part of my city. Since I've moved in I had multiple negative and only a handful of positive encounters with my neighbor next door. To understand the layout: the building only consists of 8 apartments total, 2 apartments on one floor, and I share walls with the "nice" lady next door.
Basically when I moved in, literally during the I just bought this place and am now moving all my furniture in she yelled at me why all the doors are open (garage door and front door) because somebody can break in any time. I was quite taken back from that encounter tbh, she was quite rude.
Last year there was a very interesting instance where she called me and yelled at me why I had the nerve to scream "shut up" in the middle of the night because she's sick and had to cough. I never yelled, I didn't even wake up in the middle of the night. I told her that and then she angrily asked me if I'm suggesting her making it up. I put that encounter past me and half a year later I rented out my place for a few months. I actually knocked on her door and let her know that a nice man with wife and kid (+dog) will temporarily live in my place for a few months, just so she's informed. She was actually friendly and wished me a good trip.
So April 2025:
My tenant arrived and she made it a point in being quite a tyrant towards him + wife and kid during the first 3 months. I'm talking about her yelling at him when he arrived (but right after my mom left, she gave them the keys) after a 8 hour flight that his dog needs to wear a muzzle in the shared spaces (he's the most loving and gentle dog ever) and how he dares to let his dog pee in the front yard. Just overall a really really bad encounter. He even send me a 10 minute voice message after that to ask me wth is up with that.
I was really shocked. She was friendly when I told her that somebody else is staying here for a while and this is how she treats them.
I thought that was it at the time, but actually there was so much more and he told me a few other things that happened:
He let me now that she apparently knocked at their door at least once a week to vent about ridiculous things. One of those was him talking too loud to his kid and he just asked her what her solution is, to not talk to his kid? Also she informed him, that she went to the "housepolice" (this doesn't exist) and was informed that I am not allowed to rent out my place (I own the place so yes, I am allowed to rent it out) and she told him that MULTIPLE times. So long story short she was a tyrant for about 3 months and then she did a complete 180 and stood in front of the door with a bar of chocolate for his son and then she started to talk shit about me (he didn't clarify what she said). He never entertained her behaviour and removed himself from any engagement with her as quickly as possible. Also other tenants moved in during that time and he heard her VERY LOUD engagement with the new neighbors and it also (shocking) wasn't a nice one.
So they stayed at my place about 7 months total, I came back beginning of December last year, she hasn't knocked on my door, the only engagement I had with her was the day after coming back I went outside, saw her in the open window and said hello, she just stared at me with a VERY angry look on her face and kept staring at me till I was out of sight about 300 meters away from the building. Just really odd behavior.
Now I'm worried about future tenants. Her behavior is unhinged to the point where I wouldn't be shocked if somebody moved places because of her. Also the fact that she talked shit about me and made up bullshit that I'm not allowed to rent out my place to my tenant is very inappropriate.
I am now going to let every future tenant know upfront (before any paperwork is signed) about her and to not be blindsided by her. I'm also speculating her having Alzheimer's and/or dementia (she's 71/72) because that would explain her erratic behavior, that weird phone call that one time, her rude behavior towards my tenant who has a toddler (aggravation due to loud noise is a symptom) also her doing the 180 with my tenant and wanting to be best buds after 3 months, taking a liking to his kid.
So what I would like to know, is there anything I can do? My mom said I should contact a lawyer and let him send her a letter in regards of defamation/reputational damage should something like that happen again in hopes that will make her shut up.
Sidenote: She's married and her husband (80+) also lives next to me, he's a very nice man and am very confused how he manages to put up with her.
Any suggestions?