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 seems to be a bit over the top. This sounds like a self-important busibody rather than a physical assault risk. The law allows a majority of owners to vote to remove a committee member from the committee at an EGM. Just proposing and seeking support for such an action may be enough to curb her more excessive behaviour. Have a look at this from our sponsors Bannerman Lawyers.