Leukocytoclastic Vasculitis?

My mother was diagnosed with Leukocytoclastic Vasculitis many years ago, and has been off and on steroids for years. While her condition seems to be relatively stable, my question is, can this disease cause damage to the brain...if so what kind of damage can it do and what would some of the symptoms be, reason being, my mother is displaying some strange behavior that I've never seen before..and on her last doctors visit, she was told that brain damage can occur, she is also in her late 50's, so I'm trying to establish a possible reason for this behavior change, the most things I notice is occasional forgetfulness, deliberate lying, confusion, she gets quite emotional, this is causing alot of problems in my relationship and with my child as well, as we all live together at the moment, just in general not normal behavior for her...any help would be greatly appreciated