We have bought a modest house on a housing estate to let out as an investment as our private pensions are worth very little. It transpires that the elderly lady next door (aged 73) has mental health issues and is extremely paranoid. Her windows are covered in strange written rantings about the war and she has fallen out with all the other neighbours. Police have been involved. My conversations with the lady have been brief but strange as she soon descends into paranoia about neighbours, Italians, people at bus stop whatever. She is known for banging her front door hard multiple times in succession and screaming loudly. She has done it while we have been there doing up the house. We have a very nice young couple moving in next week who work from home. Is there any point trying to reason with the neighbour and asking her not to do the door banging screaming thing? We don't want our tenants upset but I don't want to provoke her either.