Kristi Lyn Goss, 44, who left the job after the allegations came to light, was scheduled to go to trial this week. Instead she entered a guilty plea and a sentencing hearing is scheduled for Nov. 22.
Goss was arrested in October of 2016. She had been employed as a judicial administrative assistant since 2004.
The Hot Springs Sentinel Record said an affidavit filed in the case accused her of paying her personal bills and buying personal items with the credit card since 2011.
Garland County Comptroller Susan Ashmore discovered the discrepancies in May 2016 after Goss failed to pay county bills on time.
The newspaper said a legislative auditor discovered 3,722 charges made on the card between December 2011 and May 2016 and confirmed $70,523.64 in personal purchases made by Goss.
The auditor also identified $92,074.48 in additional purchases suspected to be personal in nature, based on the names of the businesses where the purchases were made. The total amount of unauthorized purchases was $162,598.
Goss apparently used the card to pay for her electric bills, cellphone bills, car payments, tickets to Arkansas Razorback games, her personal real estate taxes, pet insurance and a tuxedo for her dog.