Are you an owner? If so, get together with enough other owners and don’t vote her in next time! If she was unbearable before, then I’m guessing she got back on the Committee because no one else put their hand up for the job. If you don’t want her on the Committee, you need to be prepared to take on the job if no one else wants it. In the meantime, if she physically assaults someone or their property, that’s a Police matter. If her behaviour is sufficiently out of line that you suspect a serious mental health issue, you could ask the Police to do a welfare check. That might give her reason to consider how her behaviour is affecting others. Then there is also the right of residents to peaceful enjoyment of their properties. That is something you could raise with the strata manager.