A 56-year-old Virginia woman admitted in federal court Friday that she stole more than $500,000 from her employer, the American Diabetes Association, prosecutors said.

Adrienne Carrington of Fredericksburg pleaded guilty to one count of wire fraud and faces a maximum penalty of 20 years in prison; her sentencing is scheduled for Jan. 20 before U.S. District Judge Claude Hilton of Alexandria’s federal court.

During a nine-year span ending in September 2010, Carrington used her position as a senior financial analyst and then treasury manager for the diabetes advocacy group to access the association’s bank accounts and to divert funds to her own account. To cover up the theft, she altered internal accounting documents, federal prosecutors said.

Prosecutors said she spent the stolen money — $569,827.48 -- on visits to clothing stores, restaurants and casinos.