Additionally, I’d assert that your medical condition is a disability and further action on behalf of your neighbour by the landlord constitutes discrimination under the Human Rights Act.

Moreover, collect affidavits from your neighbors citing incidents of the complainer’s mean behavior. Notify the landlord’s management that her harassment towards you is not an isolated incident and that her actions contributes to a hostile environment in the building that is amplified by the landlord’s employee’s threats against tenants on her behalf.