It certainly does sound like someone is trying to stir the pot. Keep in mind here that rules are rules and that if the condo association wants to enforce them, they certainly have the right to do so. Try discussing the situation with the Property Manager. Perhaps you could formaly appeal to the board,explaining that your mother needs your assistance during her stay at the home. If you are able to illustrate that your mother needs assistance due to medical reasons, and provide supporting documentation to that effect, you may be able to successfuly get the approval for your extended stay.