A former Georgia Aquarium employee pleaded guilty this week to stealing nearly $250,000 during the 11 months she worked there, the Fulton County District Attorney’s Office said Thursday.

Marina Magvrone Davis, 24, pleaded guilty as indicted to one count of Georgia RICO, or racketeer influenced and corrupt organizations, and 11 counts of theft by taking, DA Paul Howard said.

After her guilty plea, Davis was sentenced to 20 years in prison, to serve four, and was ordered to pay restitution in the amount of $110,000. Davis is also prohibited from holding a position of trust or fiduciary capacity during the length of her sentence, a spokeswoman for Howard said.

Davis worked as account assistant at the aquarium from February 2012 until January 2013, when she quit, according to investigators. When she quit, a manager discovered that refunds had not been handled correctly, and an outside accounting firm was hired.

Investigators determined that Davis fraudulently processed approximately 114 refunds to more than a dozen debit cards, which were linked to either her or her roommate’s bank accounts. Davis was booked into the Fulton County jail on Nov. 1, 2013, and was released the following day on $10,000 bond, jail records showed.

Trial is pending for Davis’ roommate, 25-year-old Ebone Curtisha Ray. Ray failed to appear in court Monday and a bench warrant was issued for her arrest, the DA’s office said. Ray was not in custody late Thursday.