A Troy woman pleaded guilty Thursday to grand larceny, tax fraud and forgery after authorities say she stole more than $800,000 from her place of employment in Albany.Michelle Quentin, 54, worked at the marketing firm, Zone 5, Inc., at 25 Monroe St., and is said to have falsified and cashed more than 1,000 company checks between April 2009 and June 2016, according to Albany County District Attorney P.