The Belsize Park architect was issued with a formal reprimand after the committee concluded that she had allowed a local domestic project to run out of control because she had failed to offer written advice to either the contractor or the client.
However, she had one incompetence charge dropped and was found not guilty of another two. On a further two charges the committee decided she had no case to answer.
Peter Verdin, the committee's chaiman, said: 'With regard to penalty, the committee recognises that the complaint was initially made in May 2001 and that for various reasons the matter has been hanging over the defendant for over four years.
'The committee considers that an appropriate penalty would be a reprimand in respect of the two charges on which the defendant has been found guilty.'
The ARB is likely to face heavy criticism for taking the case as far as it did. Long term critics will say that the fact that she was found guilty of just two of the seven charges will point towards mistakes being made in the PCC process.
And this case comes just two months after Market Harborough-based Anthony Rodgers was cleared of a series of serious accusations - a case that cost the board over £20,000.