Mankato (KMKO)-A 57-year-old woman faces felony theft charges for allegedly stealing over $11,000 while working at a gas station in Mankato.  The owner of the Super Stop and Wash station called police in May of 2011 because of some suspicious activity on Mary Mackey's cash register.  Investigators reviewed her transactions over a five month period and found evidence of the theft.  Mackey denies any wrongdoing.  Her first court appearance is scheduled for July 19th.