What did she slie about?
Getting paid for services rendered is not a grant, not free government money and in fact because the government payments to the medical profession are way below the normal rates is is questionable that the payments are that desirable.
Bachmann has also lied about the family farm, of which she and her husband own a part of, but which she keeps claiming is her f-i-l's.
Telling the truth would be better and easy to then brush off the "hypocrite" cry, should it come to that. Lying, OTOH, just make her look really bad, when the facts come out.