Independence of the Audit Office

Dear Editor,
The question of whether the Office of the Auditor General was independent was recently raised in relation to the Polar Beer/Customs probe. I note that Mrs Geetangali Singh, wife of the Minister of Finance, is an Audit Director in the Office of the Auditor General (see http://www.audit.org.gy/staff.html).

Since the Audit Office has to audit the books of this country which come under the responsibility of the ministry and by extension the Minister, how could it be considered independent of the ministry with such a relationship of key members being present?
Yours faithfully,
(Name and address provided)