What can be done about condo association's disruptive owner?

What can be done about a disruptive owner in a Condo Association? We have an individual who was thrown off the condo association board by a vote of homeowners 2 years ago because she was disruptive to the condo board duties (wasting money by constantly calling the attorney, uncooperative at board and public meetings, etc.).

Now this individual refuses to stop badgering the board at every meeting and will not relinquish the floor when she is called out of order. Additionally, she walks the community trying to get petitions signed whenever the condo board tries to accomplish anything. She threatens legal action (but never follows through). Unfortunately, our condo association's attorney bills have increased from a few thousand dollars a year to almost $50,000 primarily due to her disruptive actions and the condo board having to address all of her actions and threats. Can anything be done to make this person go away or stop her from holding the community hostage? The board is having trouble meeting it's responsibilities because they are constantly dealing with this owner and we're paying for it in increased condo fees.