You have the right to remain silent. Anything you say can, and WILL be used against you in a court of law (and by the board of nursing).
You have the right to an attorney to be present with you for any and all questioning by the board investigator(s) and by the board.
If you cannot afford an attorney, one will be appointed to you for criminal cases only.
If you have your own liability insurance with a licensure defense clause, your attorney will most likely be covered. If you rely solely on your employer's liability insurance coverage, you might be in big trouble if the employer settles the case and then decides to come after you.
NEVER face the board of nursing or any other licensing board without an attorney with
experience facing that licensing board (criminal defense attorneys usually have no idea what facing a board of nursing investigation is about).
NEVER, EVER believe an investigator when they tell you it will be OK, they only want to help, or none of this will be on the record.