Negligent or Mentally Unstable Owner

We have an owner who refuses to fix plumbing in her unit, emails threatening messages to board members about "elder abuse", and won't be there to let maintenance or board members in to review her complaints.
Her gross negligence is becoming a concern due to the mildew and possibility of mold moving to other units.
Do we have a legal way to impose on her to fix her unit before it causes harm to others or are the neighboring units left waiting until mold spreads to their units.
A plumber and board members have had to breakin (move a sliding door) to get in to fix a plumbing break before. The owner a year later still believes that her leaking tub faucet was caused by this plumber and has not had it fixed.
She never provide a phone number or calls or property managements, just send crytic emails to the board.

There should be a law that would allow a HOA to impose legal requirements that an owner fix up something before it gets moved into the vortex of foreclosure. Is there anything like this? Clearly this could affect more peopel and cost more money in the long run. Part of the HOA reponsibility to take care of the building, thre should be a law that allows an HOA to require an owner fix things.