Okay first try this guy, he does not like abuse and they are abusing their relative power over her, big time:
If I’m reading you right, the flat she has been offered is not as good but also it fundamentally is not her HOME, at her age she has a right to remain untroubled by these assholes and live her life in the place she has been in for a longer time.
I absolutely HATE people who abuse the elderly, right there with child abuse and animal abuse.
Bear with me, there are other things but that was the first came to mind, I’ll run some searches and see what I can find (that’s not finger-pointing at you to search, I know the relevant terms and recall the posts that exist, you do NOT )
#1 - I don’t know if you have access to all the materials but this guy is a skilled root worker:
#2 - some hardcore baneful stuff:
#3 - more chilled, and you can do this in your own home and bind them away from your mother, this is probably the least equipment-intensive and dark method but it IS very effective and gives satisfactory results:
#4 - suggestions from a similar thread of a problematic neighbour: