atlantic city poker (Photo: A poker table in Atlantic City, New Jersey, March 14, 2009/Tim Shaffer)

A nun with a fondness for gambling trips to Atlantic City was accused of embezzling more than $850,000 from a suburban Catholic college where she oversaw the school’s finances, officials said on Friday.

Sister Marie Thornton, former vice president of finance at Iona College in New Rochelle, New York, is charged with sending phony invoices to the school to pay off personal credit card bills and expenses, the Attorney’s office said.

The thefts occurred between 1999 and 2009, when Thornton resigned, court documents said. She entered a plea of not guilty to a federal embezzlement charge.

Iona officials issued a statement saying the school has taken action, implemented new financial oversight controls and recovered most of the missing funds.

The U.S. Attorney’s office originally said the theft was more than $1.2 million but on Friday revised the amount to more than $850,000, saying it had originally miscalculated.