Spence's 2012 hunger strike was criticized by other candidates
The final vote count is expected to be made public on Wednesday.
Her liquid diet last winter made her a household name, but it also put her at the centre of criticism in the election.
The reserve has received $90 million in federal funding since 2005 and the federal government hired Deloitte to conduct an audit in 2011 to find out how that money was spent.
The audit revealed a "serious problem” in the reserve’s financial records, as only about 20 per cent of the transactions were properly documented.
Spence’s supporters said, however, that the reserve’s accounting practices have improved since she became chief, as the transactions that have no issues went from 15 per cent to 33 per cent after she took over.
For more on Attawapiskat, see Natives Subsidize Canada, Not Vice Versa and Online Hatred Against First Nations.